>>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.
>
>
>That is why I use SYS(2000) when I want to know if the file exists in a specific location.

Me too, but here we were talking about MODIFY COMMAND that also opens the file if it's found even if the path specified is wrong.