Zenonas,
If you are using VFP and VC++ forget the FLL entirely, just create DLLs with VC++ and call them from VFP. There is an example of how to do this on my website in the spyin.zip file.
>I don't know how to make(compile and link) .FLL library with Visual C++ 5. Can I use old Winc7.mak file for project. Thank Guru's for any help.