Error #2101 opening file from webserver

[Cris]

hi,
i have an application where i can open a visio file from web page and edit it.
recently i cant do it, i have revised a lot of things and dont find any
solution.

Then i try to open the file from visio application directly from the web
server (http://webserver//blablabla/file1.vsd) and visio show me a message
like "Internal Error #2101 Opening File" i have visio inm spanish so maybe
the translation of error message dont be the same i put, but the idea it's
there....

Any ideas?

i'm running visio standard 2003 sp2 over windows XP professional sp2

Thanks in advance and sorry my english.