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PowerPoint: Link within Email -> Check out do not work properly

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This KB describes the problem exactly and brings up a solution: https://support.microsoft.com/kb/2661910

 

But in a few sentences.

There are two ways to solve that problem:

  1. add a RegKey to all Clients
    Windows Registry Editor Version 5.00
    [HKEY_CLASSES_ROOT\MIME\Database\Content Type\application/vnd.ms-powerpoint.presentation.12]
    "Extension"=".pptx"
  2. Set the Browser File Handling setting within WebApplication settings to permissive instead of strict.

Here's a little more information to "Browser File Handling" (what is it)

https://social.technet.microsoft.com/wiki/contents/articles/8073.sharepoint-2010-and-2013-browser-file-handling-deep-dive.aspx