Is there a way to see if a PATH variable is used in InstallShield?

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I am maintaining a old InstallShield installer project with numerous PATH variable defined.

Is there a way from the InstallShield IDE to see if a PATH variable is used at all ?

Or should I just delete one, build, test? i.e. brute force ?

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Not exactly what you're asking, but what I usually do is to open the .ism file with a text editor and do a search for the PATH variable to see if it is used in any other table.

Do note that if you use Redistributables as installer prerequisites, a PATH variable might be used to point to their location on your machine. This is an InstallShield setting, and will not show in the .ism file, so if you don't know, you might want to check there to be safe. You'll find that in Tools -> Options -> Prerequisites (at least in InstallShield 2013).