shell-extensions

I need to write a thumbnail handler for all the files under a given folder. This folder is a mounting point for a virtual file system (using Callback File System ), and the files are actually not present physically on the local machine (they're stored in the cloud), so if I let the default thumbnail handler do its work, it will try to download the whole files from the server... which is obviously not what I want. But now I just realized that a thumbnail handler must be registered per file type : Registration of a thumbnail handler is based on standard file associations. (from the documentation

I am talking about windows shell extensions. I have a shell extension which could show the specific properties of my customized file type, say, *.filetype. And of course it will cause my shell extension dlls being loaded into the explorer.exe process. But now if I fire the FileOpen dialog in any application and check the file properties inside that dialog(notepad as an example), then these shell extension dlls would be loaded into notepad.exe process, which is the case I want to avoid. So is it possible to disable a specific shell extension in FileOpen Dialog? Thanks. Create a shim dll which

How do I loop through all items and sub items of a IContextMenu and list all available verbs? So far, I have this working code extracted from JCL: function DisplayContextMenuPidl(const Handle: THandle; const Folder: IShellFolder; Item: PItemIdList; Pos: TPoint): Boolean; var Cmd: Cardinal; ContextMenu: IContextMenu; ContextMenu2: IContextMenu2; Menu: HMENU; CommandInfo: TCMInvokeCommandInfo; CallbackWindow: THandle; vteste : string; begin Result := False; if (Item = nil) or (Folder = nil) then Exit; Folder.GetUIObjectOf(Handle, 1, Item, IID_IContextMenu, nil, Pointer(ContextMenu)); if

I have shell extension dll written in C++ and COM The dll is registered and loaded into memory. My upgrade setup program will do the following: Unregister the shell extension dll, kill the explorer.exe Copy the later version of the shell extension dll (Step 2) Start t he explorer.exe It works fine. But the issue is: If the user opened any other applications ( Internet explorer, sometimes windows task manager, notepad etc), the step Step 2 is failing. Is there any way to close all shell extension dll hooks while upgrading the dll. In the dll I am using GetOverlayInfo, context menu, database