[rt-users] 3.6.1 -> 3.8.1 attach file issues.

[Chip Mefford]

The 3.8.1 upgrade went well. resolved the auth issues okay.

Now however, when I attach an .xls file, the file comes back
corrupted, or unreadable as an .xls file. This worked okay
on 3.6.1. Perhaps I've done something wrong?

No errors are generated when attaching a file.