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I wanted to add a m4v file to the product description but Magento has a limited amount of permitted upload file types. Unfortunately there is currently not an option to add, remove, or modify these file types in the Admin Panel; but there is a way of accomplishing this by modifying a little source code.

• Look for the file: /app/code/Core/Mage/Cms/etc/config.xml

• You should create the same folder structure to inside /app/local: Copy config.xml into /app/local/Core/Mage/Cms/etc/

That’s the way to make the change upgrade proof.

Add the extensions¶

• Open the config.xml I mentioned above and around the line 100 you will find something like this:
  

  <extensions>
      <allowed>
          <jpg>1</jpg>
          <jpeg>1</jpeg>
          <png>1</png>
          <gif>1</gif>
          <pdf>1</pdf>
      </allowed>
      <image_allowed>
          <jpg>1</jpg>
          <jpeg>1</jpeg>
          <png>1</png>
          <gif>1</gif>
      </image_allowed>
      <media_allowed>
          <flv>1</flv>
          <swf>1</swf>
          <avi>1</avi>
          <mov>1</mov>
          <rm>1</rm>
          <wmv>1</wmv>
      </media_allowed>
  </extensions>
  

Notice the added <m4v>1</m4v> to the allowed extensions.

After uploading the file refresh the Magento Cache and also try to log out from the Magento Admin Panel.