How to detect the existence (or not) of a file from a precedent installation

[APJACO]

The problem is linked to that of Kirk but the answer is the same that in the Help and
perhaps because I am a newbie I don't understand clearly the way to get the drive of the file starting from the Search for file action.
In fact, I want to get the drive chosen by the user for the precedent part of the application to use it as %APPDRV%.
Why, in Help I can't find explicit example of the lines to put in my action like in AutoPlay examples (or in a sfa file).

[Darryl]

Re: How to detect the existence (or not) of a file from a precedent installation

Are you wanting to search the user's system for a file and then extract the drive letter from the path where the action located the file? If this is the case, it will be the same procedure as the reply to Kirk's, but once you have the path to the file(s), you can retrieve the drive using the "Parse Path" String action. Please explain further if I have misunderstood your question.