Kevin,

>>How many years would we have left before we are forced out of it?

As noted by Al, VFP is built with VC++7 that is widely used for business apps, including some of MS's own. It would be a monumental own goal for MS to render it obsolete while there's so much reliance... and remembering banks' adherence to COBOL decades after the gurus all said it was EOL, I can't see support dropping for VC++7 in the foreseeable future.

Meanwhile there are some form header incompatibilities in Vista and later that were not fixed by MS during its support period, resource and other files defaulting to disallowed locations under UAC; and now there are some reported issues in Win10. These issues are remedied by VFP Advanced that now offers a 64-bit development environment compiled with VC++10 rather than VC++7. We use it with VFP Compiler that compiles a VFP project mostly into a VC++ dll using your choice of VC++ version, up to VC++14 that was released last month and won't run on older OS. You should get a few years of certainty out of that!

http://www.baiyujia.com/vfpadvanced/f_vfpa_about.asp