Will you be showcasing all the files on your website as well? Now you can only share the link to your file, right?
I would definitely add some more compression formats, at least rar and 7zip.
There will be no showcasing of all files on the site. You will have to share the link somewhere if you want to sell the file.
Based on the feedback here I've just released an update. You are now able to upload all file formats, the only restriction is that a maximum of 4 chars is allowed in the filename extension.