private static ExplorerContextMenuItem?GetContextMenuItemApp(string app, string defaultDescription = null)
{
RegistryKey shell = Registry.ClassesRoot.OpenSubKey("Applications\\" + app + "\\shell");
//RegistryKey appPaths = Registry.LocalMachine.OpenSubKey("SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\App Paths\\" + app);
if (shell == null)
{
return(null);
}
RegistryKey open = shell.OpenSubKey("open");
if (open == null)
{
open = shell.OpenSubKey(shell.GetSubKeyNames()[0]);
}
RegistryKey command = open.OpenSubKey("command");
if (command == null)
{
return(null);
}
string appCommand = (string)command.GetValue(null);
if (appCommand == null)
{
return(null);
}
string description;
if (defaultDescription != null)
{
description = defaultDescription;
}
else
{
string filename = IOHelpers.GetFileNameFromCommandLine(appCommand);
FileVersionInfo info = FileVersionInfo.GetVersionInfo(filename);
description = info.FileDescription;
if (string.IsNullOrEmpty(description))
{
description = info.ProductName;
}
if (string.IsNullOrEmpty(description))
{
description = Path.GetFileNameWithoutExtension(filename);
}
}
return(new ExplorerContextMenuItem()
{
Command = appCommand, Header = description
});
}
/// <summary>
/// Gets a list of the applications registered to open a specified extension.
/// </summary>
/// <param name="extension">The extension to query, prefixed with a period.</param>
/// <example>
/// ExplorerContextMenuItem[] openWithList = await GetOpenWithList(".txt");
/// </example>
/// <returns></returns>
public static async Task <ExplorerContextMenuItem[]> GetOpenWithList(string extension)
{
return(await Task.Factory.StartNew <ExplorerContextMenuItem[]>(() =>
{
try
{
List <ExplorerContextMenuItem> items = new List <ExplorerContextMenuItem>();
// Keep a list of all the apps added - we don't want to add an app more than once.
HashSet <string> apps = new HashSet <string>();
//
// OpenWithList
//
RegistryKey openWithList = Registry.ClassesRoot.OpenSubKey(extension + "\\OpenWithList");
if (openWithList != null)
{
string[] openWith = openWithList.GetSubKeyNames();
foreach (string each in openWith)
{
ExplorerContextMenuItem?item = GetContextMenuItemApp(each);
if (item != null)
{
string appPath = IOHelpers.GetFileNameFromCommandLine(item.Value.Command);
if (!apps.Contains(appPath))
{
apps.Add(appPath);
items.Add(item.Value);
}
}
}
}
//
// OpenWithProgIds
//
RegistryKey progIds = Registry.ClassesRoot.OpenSubKey(extension + "\\OpenWithProgIds");
if (progIds != null)
{
string[] progIdsValues = progIds.GetValueNames();
foreach (string each in progIdsValues)
{
if (string.IsNullOrWhiteSpace(each))
{
continue;
}
ExplorerContextMenuItem?item = GetContextMenuItemProgId(each, "open");
if (item != null)
{
string appPath = IOHelpers.GetFileNameFromCommandLine(item.Value.Command);
if (!apps.Contains(appPath))
{
apps.Add(appPath);
items.Add(item.Value);
}
}
}
}
items.Sort(ExplorerContextMenuItemComparer);
return items.ToArray();
}
catch { }
return null;
}));
}
private static ExplorerContextMenuItem?GetContextMenuItemProgId(string progId, string defaultAction = null, string defaultDescription = null)
{
if (defaultAction == null)
{
RegistryKey shell = Registry.ClassesRoot.OpenSubKey(progId + "\\Shell");
if (shell == null)
{
return(null);
}
defaultAction = (string)shell.GetValue(null, "open");
}
RegistryKey open = Registry.ClassesRoot.OpenSubKey(progId + "\\Shell\\" + defaultAction);
if (open == null)
{
return(null);
}
RegistryKey handler = open.OpenSubKey("Command");
if (handler == null)
{
return(null);
}
string description = (string)open.GetValue(null);
string app = (string)handler.GetValue(null);
if (string.IsNullOrEmpty(description))
{
if (defaultDescription != null)
{
description = defaultDescription;
}
else
{
string filename = IOHelpers.GetFileNameFromCommandLine(app);
FileVersionInfo info = FileVersionInfo.GetVersionInfo(filename);
description = info.FileDescription;
if (string.IsNullOrEmpty(description))
{
description = info.ProductName;
}
if (string.IsNullOrEmpty(description))
{
description = Path.GetFileNameWithoutExtension(filename);
}
}
}
else
{
description = description.Replace("_", "\\_").Replace('&', '_');
}
if (app != null)
{
return new ExplorerContextMenuItem()
{
Command = app, Header = description
}
}
;
return(null);
}