>OK, so  what's wrong with opening a file in a mapped drive?

Some programs get real funny if they cannot "get at" the drive data in the
same manner as they can on a local machine. I have seen this happen with
programs that attempt to look at the drive properties, presumably to look
for how much empty space there is, and if the drive type is not what they
expect, then they baulk. A network drive is reported as a different drive
type to a floppy, local hard drive, or CD.

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