So you’re using some old app, like FoxPro and it points to a drive letter. You only have one disk but need to spoof or mimic that drive letter. Well, subst to the rescue. Basically, pick a letter. Let’s say S: as it’s not currently in use. Then use the subst command followed by the letter followed by the path to map a drive letter to it. For example, if you want tot mount up c:/sales as S: then use this command: subst s: c:/sales Now, don’t misuse this command as a replacement for, let’s say net use. If it’s a network path still map it using the net use…