Result of probe-file for non-existent device (disk) in WIndows

I am using probe-file to determine whether a file exists. I need to 
handle the case in which the device in the file name doesn't exist 
(e.g., q in "q:/filename"). When probe-file is given such a file name, 
Windows raises a "Windows - No Disk" exception.

Is there a way I can test for the existence of the device from Lispworks 
without causing a Windows error message?

Mitch