User opens a .ppsx file from SharePoint or other network location and the file opens in PowerPoint full application. Users want the file to open in Slide show mode.
This behavior can be modified by making a registry change.
**Registry changes can be dangerous if not done correctly, you assume all risks for editing the registry.
Navigate to Key "HKEY_CLASSES_ROOT\PowerPoint.Show.12"
edit value BrowserFlags
Set the value to be 8
The possible values are
a = open in edit mode
8 = open in show mode in new window
0 = open in show mode – this opens in the browser, I would not recommend this, the power point process could possibly get stuck and stay running even after the slide show ended.