>How do I know if a Drive Letter exist.

Hi Plinio,

To add to what John and Vlad have said, you can also access the Windows API, by calling either GetLogicalDrives() or GetLogicalDriveStrings(). I prefer using the former like this:

DECLARE INTEGER GetLogicalDrives IN Win32API
lndrives = GetLogicalDrives()
* If a bit is set the drive exists
* Test if F: exists
llresult = BITTEST(lndrives, 5)

The bits (0-25) represent whether or not a drive is mapped to that letter. Bit 0 is A:, bit 1 is B:, etc.