How to : Add new file type in SharePoint 2010

Hi all,

Today’s task is to add a new managed file type.

The file type is .dmmx from Dropmind.

To achieve this request, I’m following the blog page of Romain K.

Step 1 : Assign an icon to the document in SharePoint

  1. Find a png image of the icon of 16 x 16 pixel with transparency : 

  2. Copy this .png file to your Hive14 folder : ..\14\Template\Images\dropmind.png

  3. Register the picture in the ..14\Template\xml\DOCICON.XML file

        In the section <ByExtension>, add:

                <Mapping Key="dmmx" Value="dropmind.png" />

  4. Save the file and test the upload of a .dmmx file:

Step 2 : Declare document mime type as “downloadable” in IIS

  1. Open IIS Console, and browse to your Web Application

  2. Double click on the “Mime Types” menu of the selected Web Application (because I only allow this type of files on a specific Web App)

  3. In the “Action Pane”, top right of the IIS Console, click on the “Add…” button

  4. Declare the custome Mime Type:

  5. Via PowerShell, let’s declare the Mime Type as “Downloadable”:

          $web = Get-SpWebApplication -Identity <WebApplication>

          $web.AllowedInlineDownloadedMimeTypes.Add("application/vnd.dropmind")

          $web.Update()

  6. Now, I’m able to download the file from my SharePoint Site:

Thank's all folks