Deja Vu X 2 was unable to export the following files

[spiros]

Deja Vu X 2 was unable to export the following files

In my case it was an Excel file and the issue was solved by renaming the file to something simple and reimporting /  pretranslating.
The file name contained the character æ which I suspect was the issue.

For other solutions check here:
http://www.proz.com/forum/d%C3%A9j%C3%A0_vu_support/48893-deja_vu_x%3A_unable_to_export_file.html

[spiros]

See also:
http://tech.groups.yahoo.com/group/dejavu-l/message/108317