>I don't know of a better way...
>
>In my case, I had added a file manually to cause my woes... I have seen certain cases where the project mgr seems to skip over files that should be included in the build with no explanation.

My trick to add files to project is an intellisense macro... script goes like this:

LPARAMETER oFoxCode
oFoxcode.Valuetype ="V"
return [_vfp.projects(1).files.add("~")]

...and I only have to drop the filename from the previous line where I was editing it. Project manager then knows where to put it by its type.

In your case, having a file in the project marked as wrong type is sure to produce unpredictable results. Don't remember whether I had such a problem; probably did sometime in 2.x :). I can only imagine how hard would it be to catch such an error.