Problem adding .wmv file to Omeka.net

Whenever I try to add a video file (regardless of format), I receive the following error message:

File Upload: The file 'Kay Ryan - Casa Romantica.wmv' could not be ingested because it has a disallowed MIME type (video/x-ms-asf; charset=binary)

Is there a way to fix this? We have the 1GB plan in Omeka.net.

Thanks!