HT3345 How do I open a password protected excel file created on a PC? I get a message that the "file is encrypted and can't be opened"

How do I open a password protected excel file created on a PC in numbers 09, on a MacBook Air? I get a message that the "file is encrypted and can't be opened"

This is actually not true; I support users who are doing this w/ Excel 2011 (v14.2.2+) for Mac and Windows users w/ Excel 2003 & 2007. Win users are from finance dept, and who have pasword-protected various budget files. The Mac users are (surprise) "creative" users, who enter pw to unlock and edit these budget files.
These files are shared from a Mac server (running 10.6.8 server), and I do have an erratic problem where all users have read-only access to these pw-protected Excel files. The manual work-around has been to copy the troublesome file(s) and confirm users have full access again. I also do a shuffling of filenames, so that the new, working file has original file name.
FYI: the Mac server POSIX and ACL permissions are correct, and don't appear to be source of the problem.
It's easy an SMB file-locking issue or concurrent users trying to edit these files. I keep reminding them that Excel is not a database!

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HT3345 How do I open a password protected excel file created on a PC? I get a message that the "file is encrypted and can't be opened"

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