cffile ZIP mime type problem

I created an empty text file, zipped it with Windows XP's compression utility and attempted to run it through a form which uses cffile.  I've also tried 3 other zip files from various sources (not sure of the compression utility used). As you can see from the error below, I specified application/zip and application/x-zip-compressed.  Is that correct?  Is that all I need? ______________________________________________________ The MIME type of the uploaded file application/unknown was not accepted by the server. Only files of type application/vnd.ms-excel,application/msword,application/pdf,application/ zip,application/x-zip-compressed can be uploaded. Verify that you are uploading a file of the appropriate type.

After doing some googling, it appears that Firefox handles MIME types differently than IE.  I don't like allowing application/unknown files to be uploaded.  Anybody have any work-arounds? I created an empty text file, zipped it with Windows XP's compression utility and attempted to run it through a form which uses cffile.  I've also tried 3 other zip files from various sources (not sure of the compression utility used). As you can see from the error below, I specified application/zip and application/x-zip-compressed.  Is that correct?  Is that all I need? ______________________________________________________ The MIME type of the uploaded file application/unknown was not accepted by the server. Only files of type application/vnd.ms-excel,application/msword,application/pdf,application/ zip,application/x-zip-compressed can be uploaded. Verify that you are uploading a file of the appropriate type.