Disappearing files

[Stan York]

I have created a samba server to share Solaris files with NT4 and 
Win2000 workstations. In early testing it has worked ok. Today a user
created a file in a Unix directory while he was on an NT4 box.
That file is now not visible to the Windows environment through
explorer. It is visible on the Unix side and has similar permissions
to other files which are visible both places. The file is visible
using dos and mapping a drive and using the DIR command.

What has happened?