Look also this help
https://social.technet.microsoft.com/Fo ... 010general
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You will need to follow these steps exactly to make the 2010 version default. Right-click on your .mpp file and select Open With. Then select "Choose default program" Then select 2010 version from list, if it's not there use Browse button to point to 2010 version then place a chekmark on "Always use...