As far as I know, you can't have multi-user linked text table.
You might try setting everything read only, but for all purposes...a linked
txt file for multiple users is not very workable.
I don't know the origin of the text file...but importing into ms-access
would be a possible solution here...

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Albert D. Kallal (Access MVP)
Edmonton, Alberta Canada
pleaseNOOSpamKallal@msn.com
http://www.attcanada.net/~kallal.msn