Configuring FileField allowed extensions in Drupal
Problem: you try to upload a file in Drupal and you get something like this:
The selected file <file> cannot not be uploaded. Only files with the following extensions are allowed:…
for an extension that is included in Administer->File Uploads.
I found that I had the module CCK FileField installed and its allowed extensions are configured in a different place (that is very hard to find too):
Administer->Content Management->Content types.
For the File / Upload files entry click on “manage fields” under Operations the for the filed_file entry click Configure under Operations. You’ll find “Permitted upload file extensions:” there.
Hope it helps, it took me much too long to find it.