Go to “System” >> Settings >> your store
Go to ” Server” tab, at “Allowed File Mime Types” , and then add mime types:
for example, if you want to upload rar file,
Then in the column must have this line:
| application/rar “application/rar” |
Here is the complete list of Mime type:
https://www.sitepoint.com/web-foundations/mime-types-complete-list/