There're always ways to breake it :)

lcExeName = "c:\my stuff\my cool application.exe"
RUN &lcExeName

It'll work as long as there're no spaces in the path or file name.
Another example

lcDIR = "c:\my stuff"

* Macro substitution will  error out
CD &lcDir

* Name Expression will work
CD (lcDir)

>A co-worker and I are having another debate about whether or not to use spaces in folder names and EXE names.
>
>I worked at Microsoft in the VFP group and we fixed all problems related to long file names and folder names and spaces back in either VFP5 or VFP6. I was there.
>
>For example:
>
>"c:\my stuff\my cool application.exe"
>
>Is there anything wrong with that?
>
>Will it ever not work? Or will it always work because VFP was Windows certified and it has to work?
>
>Thanks in advance.