Neither of those DLLs/FLLs require registration. In fact, they cannot be registered. It means that instalation package is incorrect and has to be fixed and rebuild..

>Hi there, I'm installing an old (not that old) program compiled in VFP6.
>At the end of insdtallation I came into these four errors :
>
>Foxtools.fll
>
>Hndlib.dll
>
>xFrxlib.fll
>
>zLib.dll
>
>was unable to register itself in the system registry
>
>Obviously each file gives the same error. What can I do ?