Problems opening multiuser Access database under XP

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Guys, I've recently run on the problem I can't handle on my own. The situation is as follows:

1. I have a user running WinXP Prof

2. This user tries to open Access database that is located on the server (Win2003) and this database is in multiuser mode. User runs Access 2003

3. When this user tries to double-click this database or open it through RMB->Open nothing happens. No error messages, no open database - just nothing

4. This problem with a database appears on any PC under XP this user is trying to use.

5. This problem does not exist under W2K - on such PCs user can easily open this database

6. This problem appears only if someone already has this DB open, in this case an .lbd file being created in DB folder, and poor user can't open it. I repeat - under W2K it doesn't matter if this DB is already opened or not, everything works fine.

7. This situation rose after we've changed user OS from W2K to XP

Now, can anyone tell me what is the source of this problem and how deal with it? I've tried to search for an answer on MS site, but found nothing usefull.

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Hmm.. no ideas?