It's a normal behavior, in these tables is stored information about toolbars, and other stuffs. VFPT call it the resource files. See it at Help.
You can avoid the creation of the files creating a new file which you must name as "Config.fpw" and put (at least) this line:

RESOURCE=OFF

HTH
>When I run a Visual FoxPro exe, it creates 2 files on a client's computer:foxuser.fpt and foxuser.dbf
>Why does this happen?