>Does anyone knows what regsrv32.exe that came vith VFP5 is it for?
>When do I need to use it?
>Thanks in advance.

It's regsvr32, not regsrv32. It is used to register the COM component that lives in the dll passed in the command line:

RegSvr32 c:\Mydll.dll

Will register the server or servers housed in MyDll.dll.