Ultravnc - File Tranfer not showing mapped drive letters

Three machines.
A) Win98
B) Win XP sp1
C) Win XP sp1

Attach from C to A - file transfer shows mapped network drives.
Attach from C to B - no network drives show in file transfer window.

Ultravnc 1.0 RC18 on all machines.

Anybody else seen this?

Thanks



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