// Get file version information from a file
static BOOL
GetFileVersion(LPCWSTR szFile, verBlock *vbVersion)
{
  UINT              uLen;
  UINT              dwLen;
  BOOL              bRv;
  DWORD             dwHandle;
  LPVOID            lpData;
  LPVOID            lpBuffer;
  VS_FIXEDFILEINFO  *lpBuffer2;

  ClearVersion(vbVersion);
  if (FileExists(szFile)) {
    bRv    = TRUE;
#ifdef WINCE
    // WinCe takes a non const file path string, while desktop take a const
    LPWSTR lpFilepath = const_cast<LPWSTR>(szFile);
#else
    LPCWSTR lpFilepath = szFile;
#endif
    dwLen  = GetFileVersionInfoSizeW(lpFilepath, &dwHandle);
    lpData = (LPVOID)malloc(dwLen);
    uLen   = 0;

    if (lpData && GetFileVersionInfoW(lpFilepath, dwHandle, dwLen, lpData) != 0) {
      if (VerQueryValueW(lpData, L"\\", &lpBuffer, &uLen) != 0) {
        lpBuffer2 = (VS_FIXEDFILEINFO *)lpBuffer;

        vbVersion->wMajor   = HIWORD(lpBuffer2->dwFileVersionMS);
        vbVersion->wMinor   = LOWORD(lpBuffer2->dwFileVersionMS);
        vbVersion->wRelease = HIWORD(lpBuffer2->dwFileVersionLS);
        vbVersion->wBuild   = LOWORD(lpBuffer2->dwFileVersionLS);
      }
    }

    free(lpData);
  } else {
    /* File does not exist */
    bRv = FALSE;
  }

  return bRv;
}
// Convert a string version to a version struct
static void
TranslateVersionStr(const WCHAR* szVersion, verBlock *vbVersion)
{
  WCHAR* szNum1 = NULL;
  WCHAR* szNum2 = NULL;
  WCHAR* szNum3 = NULL;
  WCHAR* szNum4 = NULL;
  WCHAR* szJavaBuild = NULL;

  WCHAR *strVer = nsnull;
  if (szVersion) {
    strVer = wcsdup(szVersion);
  }

  if (!strVer) {
    // Out of memory
    ClearVersion(vbVersion);
    return;
  }

  // Java may be using an underscore instead of a dot for the build ID
  szJavaBuild = wcschr(strVer, '_');
  if (szJavaBuild) {
    szJavaBuild[0] = '.';
  }

  szNum1 = wcstok(strVer, L".");
  szNum2 = wcstok(NULL,   L".");
  szNum3 = wcstok(NULL,   L".");
  szNum4 = wcstok(NULL,   L".");

  vbVersion->wMajor   = szNum1 ? (WORD) _wtoi(szNum1) : 0;
  vbVersion->wMinor   = szNum2 ? (WORD) _wtoi(szNum2) : 0;
  vbVersion->wRelease = szNum3 ? (WORD) _wtoi(szNum3) : 0;
  vbVersion->wBuild   = szNum4 ? (WORD) _wtoi(szNum4) : 0;

  free(strVer);
}
NS_IMETHODIMP
nsPluginDirServiceProvider::GetFile(const char *charProp, PRBool *persistant,
                                    nsIFile **_retval)
{
  nsCOMPtr<nsILocalFile>  localFile;
  nsresult rv = NS_ERROR_FAILURE;

  NS_ENSURE_ARG(charProp);

  *_retval = nsnull;
  *persistant = PR_FALSE;

  nsCOMPtr<nsIPrefBranch> prefs(do_GetService(NS_PREFSERVICE_CONTRACTID));
  if (!prefs)
    return NS_ERROR_FAILURE;

  if (nsCRT::strcmp(charProp, NS_WIN_4DOTX_SCAN_KEY) == 0) {
    // Check our prefs to see if scanning the 4.x folder has been
    // explictly overriden failure to get the pref is okay, we'll do
    // what we've been doing -- a filtered scan
    PRBool bScan4x;
    if (NS_SUCCEEDED(prefs->GetBoolPref(NS_WIN_4DOTX_SCAN_KEY, &bScan4x)) &&
        !bScan4x) {
      return NS_ERROR_FAILURE;
    }

    // Look for the plugin folder that the user has in their
    // Communicator 4x install
    HKEY keyloc;
    long result;
    DWORD type;
    WCHAR szKey[_MAX_PATH] = L"Software\\Netscape\\Netscape Navigator";
    WCHAR path[_MAX_PATH];

    result = ::RegOpenKeyExW(HKEY_LOCAL_MACHINE, szKey, 0, KEY_READ, &keyloc);

    if (result == ERROR_SUCCESS) {
      WCHAR current_version[80];
      DWORD length = NS_ARRAY_LENGTH(current_version);

      result = ::RegQueryValueExW(keyloc, L"CurrentVersion", NULL, &type,
                                  (LPBYTE)&current_version, &length);

      ::RegCloseKey(keyloc);
      wcscat(szKey, L"\\");
      wcscat(szKey, current_version);
      wcscat(szKey, L"\\Main");
      result = ::RegOpenKeyExW(HKEY_LOCAL_MACHINE, szKey, 0, KEY_READ, &keyloc);

      if (result == ERROR_SUCCESS) {
        DWORD pathlen = NS_ARRAY_LENGTH(path);

        result = ::RegQueryValueExW(keyloc, L"Plugins Directory", NULL, &type,
                                   (LPBYTE)&path, &pathlen);
        if (result == ERROR_SUCCESS) {
          rv = NS_NewLocalFile(nsDependentString(path),
                               PR_TRUE, getter_AddRefs(localFile));
        }

        ::RegCloseKey(keyloc);
      }
    }
  } else if (nsCRT::strcmp(charProp, NS_WIN_JRE_SCAN_KEY) == 0) {
    nsXPIDLCString strVer;
    if (NS_FAILED(prefs->GetCharPref(charProp, getter_Copies(strVer))))
      return NS_ERROR_FAILURE;
    verBlock minVer;
    TranslateVersionStr(NS_ConvertASCIItoUTF16(strVer).get(), &minVer);

    // Look for the Java OJI plugin via the JRE install path
    HKEY baseloc;
    HKEY keyloc;
    HKEY entryloc;
    FILETIME modTime;
    DWORD type;
    DWORD index = 0;
    DWORD numChars = _MAX_PATH;
    DWORD pathlen;
    verBlock maxVer;
    ClearVersion(&maxVer);
    WCHAR curKey[_MAX_PATH] = L"Software\\JavaSoft\\Java Runtime Environment";
    WCHAR path[_MAX_PATH];
    // Add + 15 to prevent buffer overrun when adding \bin (+ optionally
    // \new_plugin)
#define JAVA_PATH_SIZE _MAX_PATH + 15
    WCHAR newestPath[JAVA_PATH_SIZE];
    const WCHAR mozPath[_MAX_PATH] = L"Software\\mozilla.org\\Mozilla";
    WCHAR browserJavaVersion[_MAX_PATH];

    newestPath[0] = 0;
    LONG result = ::RegOpenKeyExW(HKEY_LOCAL_MACHINE, curKey, 0, KEY_READ,
                                  &baseloc);
    if (ERROR_SUCCESS != result)
      return NS_ERROR_FAILURE;

    // Look for "BrowserJavaVersion"
    if (ERROR_SUCCESS != ::RegQueryValueExW(baseloc, L"BrowserJavaVersion", NULL,
                                            NULL, (LPBYTE)&browserJavaVersion,
                                            &numChars))
      browserJavaVersion[0] = 0;

    // We must enumerate through the keys because what if there is
    // more than one version?
    do {
      path[0] = 0;
      numChars = _MAX_PATH;
      pathlen = NS_ARRAY_LENGTH(path);
      result = ::RegEnumKeyExW(baseloc, index, curKey, &numChars, NULL, NULL,
                               NULL, &modTime);
      index++;

      // Skip major.minor as it always points to latest in its family
      numChars = 0;
      for (WCHAR *p = curKey; *p; p++) {
        if (*p == '.') {
          numChars++;
        }
      }
      if (numChars < 2)
        continue;

      if (ERROR_SUCCESS == result) {
        if (ERROR_SUCCESS == ::RegOpenKeyExW(baseloc, curKey, 0,
                                             KEY_QUERY_VALUE, &keyloc)) {
          // We have a sub key
          if (ERROR_SUCCESS == ::RegQueryValueExW(keyloc, L"JavaHome", NULL,
                                                  &type, (LPBYTE)&path,
                                                  &pathlen)) {
            verBlock curVer;
            TranslateVersionStr(curKey, &curVer);
            if (CompareVersion(curVer, minVer) >= 0) {
              if (!wcsncmp(browserJavaVersion, curKey, _MAX_PATH)) {
                wcscpy(newestPath, path);
                ::RegCloseKey(keyloc);
                break;
              }

              if (CompareVersion(curVer, maxVer) >= 0) {
                wcscpy(newestPath, path);
                CopyVersion(&maxVer, &curVer);
              }
            }
          }
          ::RegCloseKey(keyloc);
        }
      }
    } while (ERROR_SUCCESS == result);

    ::RegCloseKey(baseloc);

    static const WCHAR kMozillaVersion[] = NS_L(MOZILLA_VERSION);

    // If nothing is found, then don't add \bin dir and don't set
    // CurrentVersion for Mozilla
    if (newestPath[0] != 0) {
      if (ERROR_SUCCESS == ::RegCreateKeyExW(HKEY_LOCAL_MACHINE, mozPath, 0,
                                             NULL, REG_OPTION_NON_VOLATILE,
                                             KEY_SET_VALUE|KEY_QUERY_VALUE,
                                             NULL, &entryloc, NULL)) {
        if (ERROR_SUCCESS != ::RegQueryValueExW(entryloc, L"CurrentVersion", 0,
                                               NULL, NULL, NULL)) {
          ::RegSetValueExW(entryloc, L"CurrentVersion", 0, REG_SZ,
                           (const BYTE*) kMozillaVersion,
                           NS_ARRAY_LENGTH(kMozillaVersion));
        }
        ::RegCloseKey(entryloc);
      }

      wcscat(newestPath, L"\\bin");

      // See whether the "new_plugin" directory exists
      WCHAR tmpPath[JAVA_PATH_SIZE];
      nsCOMPtr<nsILocalFile> tmpFile;

      wcscpy(tmpPath, newestPath);
      wcscat(tmpPath, L"\\new_plugin");
      rv = NS_NewLocalFile(nsDependentString(tmpPath),
                           PR_TRUE, getter_AddRefs(tmpFile));
      if (NS_SUCCEEDED(rv) && tmpFile) {
        PRBool exists = PR_FALSE;
        PRBool isDir = PR_FALSE;
        if (NS_SUCCEEDED(tmpFile->Exists(&exists)) && exists &&
            NS_SUCCEEDED(tmpFile->IsDirectory(&isDir)) && isDir) {
          // Assume we're supposed to use this as the search
          // directory for the Java Plug-In instead of the normal
          // one
          wcscpy(newestPath, tmpPath);
        }
      }

      rv = NS_NewLocalFile(nsDependentString(newestPath),
                           PR_TRUE, getter_AddRefs(localFile));
    }
  } else if (nsCRT::strcmp(charProp, NS_WIN_QUICKTIME_SCAN_KEY) == 0) {
    nsXPIDLCString strVer;
    if (NS_FAILED(prefs->GetCharPref(charProp, getter_Copies(strVer))))
      return NS_ERROR_FAILURE;
    verBlock minVer;
    TranslateVersionStr(NS_ConvertASCIItoUTF16(strVer).get(), &minVer);

    // Look for the Quicktime system installation plugins directory
    HKEY keyloc;
    long result;
    DWORD type;
    verBlock qtVer;
    ClearVersion(&qtVer);
    WCHAR path[_MAX_PATH];
    DWORD pathlen = NS_ARRAY_LENGTH(path);

    // First we need to check the version of Quicktime via checking
    // the EXE's version table
    if (ERROR_SUCCESS == ::RegOpenKeyExW(HKEY_LOCAL_MACHINE,
                                         L"software\\Microsoft\\Windows\\CurrentVersion\\App Paths\\QuickTimePlayer.exe",
                                         0, KEY_READ, &keyloc)) {
      if (ERROR_SUCCESS == ::RegQueryValueExW(keyloc, NULL, NULL, &type,
                                              (LPBYTE)&path, &pathlen)) {
        GetFileVersion(path, &qtVer);
      }
      ::RegCloseKey(keyloc);
    }
    if (CompareVersion(qtVer, minVer) < 0)
      return rv;

    if (ERROR_SUCCESS == ::RegOpenKeyExW(HKEY_LOCAL_MACHINE,
                                         L"software\\Apple Computer, Inc.\\QuickTime",
                                        0, KEY_READ, &keyloc)) {
      DWORD pathlen = NS_ARRAY_LENGTH(path);

      result = ::RegQueryValueExW(keyloc, L"InstallDir", NULL, &type,
                                  (LPBYTE)&path, &pathlen);
      wcscat(path, L"\\Plugins");
      if (result == ERROR_SUCCESS)
        rv = NS_NewLocalFile(nsDependentString(path), PR_TRUE,
                             getter_AddRefs(localFile));
      ::RegCloseKey(keyloc);
    }
  } else if (nsCRT::strcmp(charProp, NS_WIN_WMP_SCAN_KEY) == 0) {
    nsXPIDLCString strVer;
    if (NS_FAILED(prefs->GetCharPref(charProp, getter_Copies(strVer))))
      return NS_ERROR_FAILURE;
    verBlock minVer;
    TranslateVersionStr(NS_ConvertASCIItoUTF16(strVer).get(), &minVer);

    // Look for Windows Media Player system installation plugins directory
    HKEY keyloc;
    DWORD type;
    verBlock wmpVer;
    ClearVersion(&wmpVer);
    WCHAR path[_MAX_PATH];
    DWORD pathlen = NS_ARRAY_LENGTH(path);

    // First we need to check the version of WMP
    if (ERROR_SUCCESS == ::RegOpenKeyExW(HKEY_LOCAL_MACHINE,
                                         L"software\\Microsoft\\Windows\\CurrentVersion\\App Paths\\wmplayer.exe",
                                         0, KEY_READ, &keyloc)) {
      if (ERROR_SUCCESS == ::RegQueryValueExW(keyloc, NULL, NULL, &type,
                                              (LPBYTE)&path, &pathlen)) {
        GetFileVersion(path, &wmpVer);
      }
      ::RegCloseKey(keyloc);
    }
    if (CompareVersion(wmpVer, minVer) < 0)
      return rv;

    if (ERROR_SUCCESS == ::RegOpenKeyExW(HKEY_LOCAL_MACHINE,
                                         L"software\\Microsoft\\MediaPlayer", 0,
                                         KEY_READ, &keyloc)) {
      if (ERROR_SUCCESS == ::RegQueryValueExW(keyloc, L"Installation Directory",
                                             NULL, &type, (LPBYTE)&path,
                                             &pathlen)) {
        rv = NS_NewLocalFile(nsDependentString(path), PR_TRUE,
                             getter_AddRefs(localFile));
      }

      ::RegCloseKey(keyloc);
    }
  } else if (nsCRT::strcmp(charProp, NS_WIN_ACROBAT_SCAN_KEY) == 0) {
    nsXPIDLCString strVer;
    if (NS_FAILED(prefs->GetCharPref(charProp, getter_Copies(strVer)))) {
      return NS_ERROR_FAILURE;
    }

    verBlock minVer;
    TranslateVersionStr(NS_ConvertASCIItoUTF16(strVer).get(), &minVer);

    // Look for Adobe Acrobat system installation plugins directory
    HKEY baseloc;
    HKEY keyloc;
    FILETIME modTime;
    DWORD type;
    DWORD index = 0;
    DWORD numChars = _MAX_PATH;
    DWORD pathlen;
    verBlock maxVer;
    ClearVersion(&maxVer);
    WCHAR curKey[_MAX_PATH] = L"software\\Adobe\\Acrobat Reader";
    WCHAR path[_MAX_PATH];
    // Add + 8 to prevent buffer overrun when adding \browser
    WCHAR newestPath[_MAX_PATH + 8];

    newestPath[0] = 0;
    if (ERROR_SUCCESS != ::RegOpenKeyExW(HKEY_LOCAL_MACHINE, curKey, 0,
                                         KEY_READ, &baseloc)) {
      wcscpy(curKey, L"software\\Adobe\\Adobe Acrobat");
      if (ERROR_SUCCESS != ::RegOpenKeyExW(HKEY_LOCAL_MACHINE, curKey, 0,
                                           KEY_READ, &baseloc)) {
        return NS_ERROR_FAILURE;
      }
    }

    // We must enumerate through the keys because what if there is
    // more than one version?
    LONG result = ERROR_SUCCESS;
    while (ERROR_SUCCESS == result) {
      path[0] = 0;
      numChars = _MAX_PATH;
      pathlen = NS_ARRAY_LENGTH(path);
      result = ::RegEnumKeyExW(baseloc, index, curKey, &numChars, NULL, NULL,
                               NULL, &modTime);
      index++;

      if (ERROR_SUCCESS == result) {
        verBlock curVer;
        TranslateVersionStr(curKey, &curVer);
        wcscat(curKey, L"\\InstallPath");
        if (ERROR_SUCCESS == ::RegOpenKeyExW(baseloc, curKey, 0,
                                             KEY_QUERY_VALUE, &keyloc)) {
          // We have a sub key
          if (ERROR_SUCCESS == ::RegQueryValueExW(keyloc, NULL, NULL, &type,
                                                  (LPBYTE)&path, &pathlen)) {
            if (CompareVersion(curVer, maxVer) >= 0 &&
                CompareVersion(curVer, minVer) >= 0) {
              wcscpy(newestPath, path);
              CopyVersion(&maxVer, &curVer);
            }
          }

          ::RegCloseKey(keyloc);
        }
      }
    }

    ::RegCloseKey(baseloc);

    if (newestPath[0] != 0) {
      wcscat(newestPath, L"\\browser");
      rv = NS_NewLocalFile(nsDependentString(newestPath), PR_TRUE,
                           getter_AddRefs(localFile));
    }

  }

  if (localFile && NS_SUCCEEDED(rv))
    return CallQueryInterface(localFile, _retval);

  return rv;
}
NS_IMETHODIMP
nsPluginDirServiceProvider::GetFile(const char *charProp, PRBool *persistant,
                                    nsIFile **_retval)
{
  nsCOMPtr<nsILocalFile>  localFile;
  nsresult rv = NS_ERROR_FAILURE;

  NS_ENSURE_ARG(charProp);

  *_retval = nsnull;
  *persistant = PR_FALSE;

  nsCOMPtr<nsIPrefBranch> prefs(do_GetService(NS_PREFSERVICE_CONTRACTID));
  if (!prefs)
    return NS_ERROR_FAILURE;

  nsCOMPtr<nsIWindowsRegKey> regKey =
    do_CreateInstance("@mozilla.org/windows-registry-key;1");
  NS_ENSURE_TRUE(regKey, NS_ERROR_FAILURE);

  if (nsCRT::strcmp(charProp, NS_WIN_4DOTX_SCAN_KEY) == 0) {
    // Check our prefs to see if scanning the 4.x folder has been
    // explictly overriden failure to get the pref is okay, we'll do
    // what we've been doing -- a filtered scan
    PRBool bScan4x;
    if (NS_SUCCEEDED(prefs->GetBoolPref(NS_WIN_4DOTX_SCAN_KEY, &bScan4x)) &&
        !bScan4x) {
      return NS_ERROR_FAILURE;
    }

    // Look for the plugin folder that the user has in their
    // Communicator 4x install
    rv = regKey->Open(nsIWindowsRegKey::ROOT_KEY_LOCAL_MACHINE,
                      NS_LITERAL_STRING("Software\\Netscape\\Netscape Navigator"),
                      nsIWindowsRegKey::ACCESS_READ);
    if (NS_SUCCEEDED(rv)) {
      nsAutoString currentVersion;
      rv = regKey->ReadStringValue(NS_LITERAL_STRING("CurrentVersion"),
                                   currentVersion);
      if (NS_SUCCEEDED(rv)) {
        nsAutoString childName = currentVersion;
        childName.Append(NS_LITERAL_STRING("\\Main"));
        nsCOMPtr<nsIWindowsRegKey> childKey;

        rv = regKey->OpenChild(childName, nsIWindowsRegKey::ACCESS_READ,
                               getter_AddRefs(childKey));
        if (NS_SUCCEEDED(rv) && childKey) {
          nsAutoString pluginsDirectory;
          rv = childKey->ReadStringValue(NS_LITERAL_STRING("Plugins Directory"),
                                         pluginsDirectory);
          if (NS_SUCCEEDED(rv)) {
            rv = NS_NewLocalFile(pluginsDirectory, PR_TRUE,
                                 getter_AddRefs(localFile));
          }
        }
      }
    }
  } else if (nsCRT::strcmp(charProp, NS_WIN_JRE_SCAN_KEY) == 0) {
    nsXPIDLCString strVer;
    if (NS_FAILED(prefs->GetCharPref(charProp, getter_Copies(strVer))))
      return NS_ERROR_FAILURE;
    verBlock minVer;
    TranslateVersionStr(NS_ConvertASCIItoUTF16(strVer).get(), &minVer);

    rv = regKey->Open(nsIWindowsRegKey::ROOT_KEY_LOCAL_MACHINE,
                      NS_LITERAL_STRING("Software\\JavaSoft\\Java Runtime Environment"),
                      nsIWindowsRegKey::ACCESS_READ);
    NS_ENSURE_SUCCESS(rv, rv);

    verBlock maxVer;
    ClearVersion(&maxVer);

    nsAutoString newestPath;
    nsAutoString browserJavaVersion;
    regKey->ReadStringValue(NS_LITERAL_STRING("BrowserJavaVersion"),
                            browserJavaVersion);

    PRUint32 childCount = 0;
    regKey->GetChildCount(&childCount);

    // We must enumerate through the keys because what if there is
    // more than one version?
    for (PRUint32 index = 0; index < childCount; ++index) {
      nsAutoString childName;
      rv = regKey->GetChildName(index, childName);
      if (NS_SUCCEEDED(rv)) {
        // Skip major.minor as it always points to latest in its family
        PRUint32 numChars = 0;
        PRInt32 offset = 0;
        while ((offset = childName.FindChar(L'.', offset + 1)) >= 0) {
          ++numChars;
        }
        if (numChars < 2)
          continue;

        nsCOMPtr<nsIWindowsRegKey> childKey;
        rv = regKey->OpenChild(childName, nsIWindowsRegKey::ACCESS_QUERY_VALUE,
                               getter_AddRefs(childKey));
        if (NS_SUCCEEDED(rv) && childKey) {
          nsAutoString path;
          rv = childKey->ReadStringValue(NS_LITERAL_STRING("JavaHome"), path);
          if (NS_SUCCEEDED(rv)) {
            verBlock curVer;
            TranslateVersionStr(PromiseFlatString(childName).get(), &curVer);
            if (CompareVersion(curVer, minVer) >= 0) {
              if (browserJavaVersion == childName) {
                newestPath = path;
                break;
              }

              if (CompareVersion(curVer, maxVer) >= 0) {
                newestPath = path;
                CopyVersion(&maxVer, &curVer);
              }
            }
          }
        }
      }
    }

    if (newestPath.IsEmpty()) {
      return NS_ERROR_FAILURE;
    }

    // We require the newer NPAPI Java plugin.
    newestPath += NS_LITERAL_STRING("\\bin\\new_plugin");

    rv = NS_NewLocalFile(newestPath,
                         PR_TRUE, getter_AddRefs(localFile));

    if (NS_SUCCEEDED(rv)) {
      nsCOMPtr<nsIWindowsRegKey> newKey =
        do_CreateInstance("@mozilla.org/windows-registry-key;1");
      NS_ENSURE_TRUE(newKey, NS_ERROR_FAILURE);

      rv = newKey->Create(nsIWindowsRegKey::ROOT_KEY_LOCAL_MACHINE,
                          NS_LITERAL_STRING("Software\\mozilla.org\\Mozilla"),
                          nsIWindowsRegKey::ACCESS_QUERY_VALUE |
                          nsIWindowsRegKey::ACCESS_SET_VALUE);
      if (NS_SUCCEEDED(rv)) {
        PRBool currentVersionExists = PR_FALSE;
        newKey->HasValue(NS_LITERAL_STRING("CurrentVersion"),
                         &currentVersionExists);
        if (!currentVersionExists) {
          newKey->WriteStringValue(NS_LITERAL_STRING("CurrentVersion"),
                                   NS_LITERAL_STRING(MOZILLA_VERSION));
        }
      }
    }
  } else if (nsCRT::strcmp(charProp, NS_WIN_QUICKTIME_SCAN_KEY) == 0) {
    nsXPIDLCString strVer;
    if (NS_FAILED(prefs->GetCharPref(charProp, getter_Copies(strVer))))
      return NS_ERROR_FAILURE;
    verBlock minVer;
    TranslateVersionStr(NS_ConvertASCIItoUTF16(strVer).get(), &minVer);

    // Look for the Quicktime system installation plugins directory
    verBlock qtVer;
    ClearVersion(&qtVer);

    // First we need to check the version of Quicktime via checking
    // the EXE's version table
    rv = regKey->Open(nsIWindowsRegKey::ROOT_KEY_LOCAL_MACHINE,
                      NS_LITERAL_STRING("software\\Microsoft\\Windows\\CurrentVersion\\App Paths\\QuickTimePlayer.exe"),
                      nsIWindowsRegKey::ACCESS_READ);
    if (NS_SUCCEEDED(rv)) {
      nsAutoString path;
      rv = regKey->ReadStringValue(NS_LITERAL_STRING(""), path);
      if (NS_SUCCEEDED(rv)) {
        GetFileVersion(PromiseFlatString(path).get(), &qtVer);
      }
      regKey->Close();
    }
    if (CompareVersion(qtVer, minVer) < 0)
      return rv;

    rv = regKey->Open(nsIWindowsRegKey::ROOT_KEY_LOCAL_MACHINE,
                      NS_LITERAL_STRING("software\\Apple Computer, Inc.\\QuickTime"),
                      nsIWindowsRegKey::ACCESS_READ);
    if (NS_SUCCEEDED(rv)) {
      nsAutoString path;
      rv = regKey->ReadStringValue(NS_LITERAL_STRING("InstallDir"), path);
      if (NS_SUCCEEDED(rv)) {
        path += NS_LITERAL_STRING("\\Plugins");
        rv = NS_NewLocalFile(path, PR_TRUE,
                             getter_AddRefs(localFile));
      }
    }
  } else if (nsCRT::strcmp(charProp, NS_WIN_WMP_SCAN_KEY) == 0) {
    nsXPIDLCString strVer;
    if (NS_FAILED(prefs->GetCharPref(charProp, getter_Copies(strVer))))
      return NS_ERROR_FAILURE;
    verBlock minVer;
    TranslateVersionStr(NS_ConvertASCIItoUTF16(strVer).get(), &minVer);

    // Look for Windows Media Player system installation plugins directory
    verBlock wmpVer;
    ClearVersion(&wmpVer);

    // First we need to check the version of WMP
    rv = regKey->Open(nsIWindowsRegKey::ROOT_KEY_LOCAL_MACHINE,
                      NS_LITERAL_STRING("software\\Microsoft\\Windows\\CurrentVersion\\App Paths\\wmplayer.exe"),
                      nsIWindowsRegKey::ACCESS_READ);
    if (NS_SUCCEEDED(rv)) {
      nsAutoString path;
      rv = regKey->ReadStringValue(NS_LITERAL_STRING(""), path);
      if (NS_SUCCEEDED(rv)) {
        GetFileVersion(PromiseFlatString(path).get(), &wmpVer);
      }
      regKey->Close();
    }
    if (CompareVersion(wmpVer, minVer) < 0)
      return rv;

    rv = regKey->Open(nsIWindowsRegKey::ROOT_KEY_LOCAL_MACHINE,
                      NS_LITERAL_STRING("software\\Microsoft\\MediaPlayer"),
                      nsIWindowsRegKey::ACCESS_READ);
    if (NS_SUCCEEDED(rv)) {
      nsAutoString path;
      rv = regKey->ReadStringValue(NS_LITERAL_STRING("Installation Directory"),
                                   path);
      if (NS_SUCCEEDED(rv)) {
        rv = NS_NewLocalFile(path, PR_TRUE,
                             getter_AddRefs(localFile));
      }
    }
  } else if (nsCRT::strcmp(charProp, NS_WIN_ACROBAT_SCAN_KEY) == 0) {
    nsXPIDLCString strVer;
    if (NS_FAILED(prefs->GetCharPref(charProp, getter_Copies(strVer)))) {
      return NS_ERROR_FAILURE;
    }

    verBlock minVer;
    TranslateVersionStr(NS_ConvertASCIItoUTF16(strVer).get(), &minVer);

    // Look for Adobe Acrobat system installation plugins directory
    verBlock maxVer;
    ClearVersion(&maxVer);

    nsAutoString newestPath;

    rv = regKey->Open(nsIWindowsRegKey::ROOT_KEY_LOCAL_MACHINE,
                      NS_LITERAL_STRING("software\\Adobe\\Acrobat Reader"),
                      nsIWindowsRegKey::ACCESS_READ);
    if (NS_FAILED(rv)) {
      rv = regKey->Open(nsIWindowsRegKey::ROOT_KEY_LOCAL_MACHINE,
                        NS_LITERAL_STRING("software\\Adobe\\Adobe Acrobat"),
                        nsIWindowsRegKey::ACCESS_READ);
      if (NS_FAILED(rv)) {
        return NS_ERROR_FAILURE;
      }
    }

    // We must enumerate through the keys because what if there is
    // more than one version?
    PRUint32 childCount = 0;
    regKey->GetChildCount(&childCount);

    for (PRUint32 index = 0; index < childCount; ++index) {
      nsAutoString childName;
      rv = regKey->GetChildName(index, childName);
      if (NS_SUCCEEDED(rv)) {
        verBlock curVer;
        TranslateVersionStr(PromiseFlatString(childName).get(), &curVer);

        childName += NS_LITERAL_STRING("\\InstallPath");

        nsCOMPtr<nsIWindowsRegKey> childKey;
        rv = regKey->OpenChild(childName, nsIWindowsRegKey::ACCESS_QUERY_VALUE,
                               getter_AddRefs(childKey));
        if (NS_SUCCEEDED(rv)) {
          // We have a sub key
          nsAutoString path;
          rv = childKey->ReadStringValue(NS_LITERAL_STRING(""), path);
          if (NS_SUCCEEDED(rv)) {
            if (CompareVersion(curVer, maxVer) >= 0 &&
                CompareVersion(curVer, minVer) >= 0) {
              newestPath = path;
              CopyVersion(&maxVer, &curVer);
            }
          }
        }
      }
    }

    if (!newestPath.IsEmpty()) {
      newestPath += NS_LITERAL_STRING("\\browser");
      rv = NS_NewLocalFile(newestPath, PR_TRUE,
                           getter_AddRefs(localFile));
    }
  }

  if (localFile && NS_SUCCEEDED(rv))
    return CallQueryInterface(localFile, _retval);

  return rv;
}