Matthew,
I don't know (?). I set out as you did: trial and error, eliminating each file until all works. I do know that I need the OLE files (FXOLE30B.DLL, OLEAUT32.DLL, OLEPRO32.DLL), as I too have an OCX control (I didn't list it in the message), and it would not work without them (since the control is in an OLE container). You may want to check if the control will work without those files (your test machines may all have them already installed - I had this concern before). Maybe the rest are standard with Windows, I don't know. I tested on new machines that had NEVER had a FoxPro app installed before (or much of anything else, for that matter). If your's works - that's all that matters :).
-Good to see that other's are having success with 3rd party installations!

Mark

>I am using Install Shield Express 2 and it has worked great. I only install 5 files to the Windows\System folder, they are:
>
>FOXPRO.INT
>VFP500.DLL
>VFP5ENU.DLL
>VFPOLE50.DLL
>MSACAL70.OCX
>
>Do you need the additional files to support features I am not using? When I first did the install script, I ran the VFP builder as a starting point. Then I copied my app to a new PC and watched as it errored looking for the necessary VFP files. I added each file one at a time until no more error messages. Just curious what the additional files do.
>
>I added MSACAL70.OCX since I am using the activeX calendar control, so this is really an optional files also.