>This is 'funny' :
>
>If I type MODIFY COMMAND F:\EFFE in the command window, it will open EFFE.PRG if it exists in F:\. However, if it doesn't exist there, but if there is an EFFE.PRG along the PATH, it will open that one. It shouldn't. It's a bug or at least an unwanted feature.

I guess it's an unwanted feature. FILE() function works the same way.