Actually, the extension does not work fine. Take my word for it, I wrote it. :-) I haven't looked at the code for years, but unless you made some modifications to it, it could crash Explorer on pre-W2000 if you mark a lot of files, due to overflows in the registry and other oddities. Not that it applies in this particular case though. However, you might want to migrate your stuff to another shell extension than CMenuExtender, since I can't really recommend anyone to use it any longer. And in answer to another question, the license does not prevent reworking the code and redistribute it, as indeed MHz has already done.