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PowerPoint files on a webpage may unexpectedly open in SlideShow/Edit mode

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Symptoms

When opening PowerPoint files from webpages, they may not open in the desired mode. E.g., .PPSX files may open in Edit Mode, and .PPTX files may open in Slideshow mode.

As can be seen in http://support.microsoft.com/kb/162059/en-us, the registry keys controlling this behavior for .PPSX and .PPTX are the same, making it impossible to have settings for opening .PPSX files in Slideshow mode, and at the same time have settings for opening .PPTX files in Edit mode.

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Cause

This is occurring because the server sends the MIME information to the client and from there it determines which subkey to read in the registry. There are some file types such as .PPSX which are not a registered MIME type on the server thus IE which pick which MIME type the file is.

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Resolution

If you want the result that .PPS, .PPSM and .PPSX files on webpages open in Show mode, and .PPT, PPTM and .PPTX on webpages open in Edit mode, you need to create separate MIME types:

Windows Registry Editor Version 5.00

[HKEY_CLASSES_ROOT\MIME\Database\Content Type\application/vnd.ms-powerpoint-slideshow]
"Extension"=".ppsx"

[HKEY_CLASSES_ROOT\MIME\Database\Content Type\application/vnd.ms-powerpoint-slideshow8]
"Extension"=".pps"
[HKEY_CLASSES_ROOT\.ppsx]
"Content Type"="application/vnd.ms-powerpoint-slideshow"

[HKEY_CLASSES_ROOT\.pps]
"Content Type"="application/vnd.ms-powerpoint-slideshow8"


[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Secure Mime Handlers]
"application/vnd.ms-powerpoint-slideshow"=dword:00000001

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Secure Mime Handlers]
"application/vnd.ms-powerpoint-slideshow8"=dword:00000001


[HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Secure Mime Handlers]
"application/vnd.ms-powerpoint-slideshow"=dword:00000001

[HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Secure Mime Handlers]
"application/vnd.ms-powerpoint-slideshow8"=dword:00000001


[HKEY_CLASSES_ROOT\PowerPoint.Show.12]
"PreferExecuteOnMismatch"=dword:00000001
"BrowserFlags"=dword:0000000a

[HKEY_CLASSES_ROOT\PowerPoint.Show.8]
"PreferExecuteOnMismatch"=dword:00000001
"BrowserFlags"=dword:0000000a

[HKEY_CLASSES_ROOT\PowerPoint.ShowMacroEnabled.12]
"PreferExecuteOnMismatch"=dword:00000001
"BrowserFlags"=dword:0000000a


If you need to do this on a server, please refer to

Register the 2007 Office system file format MIME types on servers
http://technet.microsoft.com/en-us/library/ee309278(v=office.12).aspx

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Keywords: kb

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Article Info
Article ID : 2712391
Revision : 1
Created on : 1/7/2017
Published on : 5/31/2012
Exists online : False
Views : 583