You probably have SET RESOURCE ON. If so, and you don't specfiy adfferent resouce file, then it is going to try to create and/or use the default FOXUSER.DBF resource file.
To prevent this from happening you need to either SET RESOURCE OFF, or if you have settings that you want all users to have you can take a copy of the FOXUSER.DBF&FPT files and rename it to, say VFPUSER.DBF & VFPUSER.FPT and include it in your project file. Then in your opening commands do someting like

SET RESO OFF
STORE SYS(2015) TO m.RESOFILE
USE VFPUSER
COPY TO (M.RESOFILE)
SET RESO TO (M.RESOFILE)
SET RESO ON

then before exiting the program

SET RESO OFF
ERASE (M.RESOFILE+'.DBF')
ERASE (M.RESOFILE+'.FPT')

HTH
//:^)