I think you want the PathName property.

From technet's "Retrieving Service Properties"

PathName

Fully qualified path to the executable file responsible for implementing the service.

             When in doubt, mumble; when in trouble, delegate; when in charge, ponder. -- James H. Boren

In reply to Re: Windows Process Executable Path is Null by NetWallah
in thread Windows Process Executable Path is Null by dt667

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