# [Multiple File Upload] FileType "application/unknown" for files with extension .rar

Forge Component

### Multiple File Upload

(47)
Published on 26 Jun (9 hours ago) by Remco Dekkinga
47 votes
Published on 26 Jun (9 hours ago) by Remco Dekkinga

Personally, I uploaded a file with the extension .rar and the system saved in the upload cache the file as "application / unknown". Is there any logic to this?

Hello,

most probably because the extension .rar is not defined as a valid one in the component, you can open the MultipleFileUpload_Extension and add it in the MimeTypes.cs.

Best Regards,

Hugo Pinheiro