>If I add LINUX to my home PC will I still be able to run VFP in Win98

Yes.

> and will I be able to run VFP through wine in LINUX?

Probably not, VFP does not show up on the list of currently running apps. Wine is advancing rapidly and I suspect that the list of apps is not being updated. It is worth a try.

>What caveats are there?

see: http://winehq.org and http://wine.codeweavers.com

ask on the Linux forum for which Linux distribution you should use