>We are preparing to update to Service Pack 1 for VFP; however, we are concerned that our users may run into issues with the "pre-release" of our application. We allow our users to download a pre-prelease version of our application. This started in early October. We are now preparing to send out final CD versions (is there ever really a final version?) using VFP9SP1. The problem is, our users will be downloading updates from our website that were compiled in SP1 and running the EXE using the original VFP9 runtime UNTIL they get their CD and install the SP1 runtimes.
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>My question is, will this work? Will they be able to run a VFP9SP1 EXE using VFP9 runtime???

If the SP1 runtime allows an older compiled EXE/APP to run without a binary mismatch error, the results are unpredictable and this is not recommended. There is no way to know for sure. We did not change the language and did not add any new commands/functions, so it may or may not work OK. But this is not supported (do this at your own risk).