You may find that your FLV videos aren’t playing or won’t download. To solve this you will need to add the FLV mime type in IIS. To do this, follow these instructions:
1) Select the site which you want to configure in IIS; right click on it and select ‘Properties’.
2) Under the ‘HTTP Headers’ tab, select “File Types” under the ‘MIME Map’ section and select ‘New Type’.
3) Type ‘.flv’ as the associated extension, and ‘video/x-flv’ as the associated content type.
4) Click ‘OK’, then restart IIS.
That’s it! Your FLV files should now play and download!