Okay I have a customer who has a .deb file that he wants to link to in his blog, which I have created for him in DotNetNuke.  DotNetNuke is an ASP.NET CMS. (content management system)

When he links to it, the user gets a 404 error, which is not what was wanted, so I needed to figure this out.

My assumption is that I need to add a MIME Type to IIS.  I found the following MIME Type, and it worked.

application/x-deb  

I first looked through several “Common MIME Type” web pages and couldn’t find the .deb extension.  Then I went to Wikipedia just because I wanted to find out more about the debian extension.  Once there I was happy to notice that it gave the “internet Media Type” (MIME Type) on the right hand side of the web page.

So make a note.  If you want to find an uncommon MIME Type, look for the extension on Wikipedia.