I need a user-mode filesystem filter (not virtual filesystem). One of such frameworks is http://eldos.com/cbflt/, but it has some bugs and I need an alternative.
Can you please suggest similar frameworks.
CallbackFilter is the only filter driver solution available. You mention dokan and fuse, but they are not filters, they are file system drivers (like Callback File System). This is a very different thing.
If you have problems with CallbackFilter, please report them to tech.support and we will address the issues ASAP.