Paths for installed flightsim platform?

#1
My add-on works with a variety of flightsim versions, so I need to know from the user what platform/version he/she is using. For my installer I am thinking of either a drop-down list, check-box, or a "search for the flightsim folder" type input.

What I think is the best way to determine the User's version (correct me if I am wrong), is using the registry for the proper installation path? If so I need to find the paths for:

P3Dv1
P3Dv2
P3Dv3
P3Dv4
FSX
FSX_SE

Does anyone have a list of any these they care to share, else how would I go about finding a version in the registry?

Thanks
 
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