How can I get another application's installation path programmatically?

The ideal way to find a program's installation path (on Windows) is to read it from the registry. Most installers will create a registry key for that program that contains the installation path. Exactly where this key is and what it will be named varies depending on the program in question.

To find if the program has a key in the registry, open 'regedit' and use the Edit > Find option to try and locate a key with the program name. If such a key exists, you can read it using the RegistryKey class in the .NET Framework library.

If the program does not have a registry key then another option is just to ask the user to locate the .exe file with the OpenFileDialog, although this is obviously not ideal.

Many (most?) programs create an App Paths registry key. Have a look at

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\App Paths

If you know the application in question (as compared to any application) registry key is the probably the best option (if one exists).

The install might put in its own custom "install path key" somewhere (so do a find as Fara mentioned) or it might be in the uninstall section for installed programs, so you could check:

• HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall

But be aware that any new version of an install could change the key it writes out, both for a custom key or for the uninstall entry. So checking the registry should probably be only for a known install\version.

tep