[Tutor] Checking for the existence of a file on workstations in Windows LAN

[R. Alan Monroe]

I'd like to check client machines on a LAN for the existence of
certain files, via their C$ share, in a corporate environment.

I can use the os.stat or os.path.exists functions to see whether the
file is there, but on those times when the functions fail, how do I
know if it was because the file genuinely didn't exist, or because I
didn't have rights to their c$ share? I need to distinguish between
the two cases. Even better would be to distinguish the third case
where the machine couldn't be found at all, likely because it's
powered off.

Alan