>The resource file is usually specific to an application (mostly called foxuser.dbf, but this can be changed)

The message is deceptive in that it has nothing to do with what we usually think of as a resource file (i. e., foxuser.dbf). The error message indicates that the resource DLL is out of sync. For English VFP, this would be VFP6RENU.DLL. This DLL contains the resource strings for VFP. IOW, if you want German VFP, all you have to do is point VFP to the German resource DLL (VFP6RDEU.DLL) with the -d command line switch. Do that, and all of your menus and dialogs will now be in German. Or just change your Windows regional settings to German, or what have you, and VFP will automagically pick that up and use the appropriate resource DLL (if available).

But how did the resource DLL get out of sync? One of the apps probably installed a resource DLL from a later service pack. The easiest way to check is to right-click the VFP.EXE in Windows Explorer, choose Properties, then click the Version tab. Make a note of the build number (last four digits), then do the same with the resource DLL. I'll bet real money that the build numbers don't match.