How to reset .msi file associations with the right Microsoft application?

Jean Cadet August 5, 2010
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Using Windows 7, my .msi files keep being opened by the Notepad instead of installing programs.

Under “Default Programs”, after I clicked ‘Associate a file type or protocol with a specific program’ it shows that the .msi extension for MSI files is associated with the notepad. Ditto the .msp extension for MSP files is associated with the notepad. I also noticed there that many extensions like .mydocs, .pcb, .pptmhtml are associated with UNKOWN application.

How can I at least have the MSI and MSP files have the correct associated Microsoft programs? Does it require going through registry to fix it?

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