If you are uploading “media” (WordPress’s term for generic files), you might have encounter the error in the title. This is because WordPress filters files by extensions as a crude security measure to protect “bad” files from being uploaded.
To enable more file types from being uploaded:
- Administration -> Super Admin -> Options
- Modify “Upload file types” to include the file types you want to allow for upload
- Save Changes
- I tried * for wildcard and it does not appear to work