I have an *.xls file on a file server that is around 11 MB. When any user tries to open this one specific file, Excel freezes for about 30 minutes, then the file is usable. The strange this is that we save nightly backups of all our files, and even past versions of this file do the same thing, even though they were working fine at the time.

Without success, I've tried:

-Copying the file to a local hard drive
-Saving as an *.xlsx and *.xlsm (this made the file open up faster, but I was unable to use the drop down list macros)
-Disable Macros
-Disable Add-ins
-Check for broken links (there was one, and once repaired, it did not change anything)