Thursday, July 21, 2016

Error downloading unsupported File Types with IIS

A customer of mine was complained that when users attempted to download unknown file types, they received a "404 - File or directory not found" error message.

The file type my user was attempting to download was a ".indd" file.


This error is caused when the filetype is not a supported "MIME" an IIS Web Server.

In the event you want to add a new unknown file type under the IIS Website, click MIME Types.


Add the unknown file extension users are attempting to download.


After adding the mime, do an "iisreset".

Users will now be able to download the unknown file type.

7 comments:

  1. You are practically suggesting that all possible file extension on the planet should be added explicitely as an entry into the IIS config? Is that serious?

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  2. In the meantime I found a workaround: add "*" as the extension, and application/octet-stream, and it will solve the issue of any unknown file extension download capability. Side effect is that it will INDEED allow ALL file extensions to be downloaded, even those that you may not wanted to be downloadable....

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