Performing registry search for a .NET windows installer application

Question

I have a .NET winform installer application. Before installing, I\'m doing a registry search to check if MS Access Runtime is installed on the machine.

Search Target Mac

Answer 1

Correct Registry Search: Try to search the proper 32-bit section of the registry: SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\App Paths\MSACCESS.EXE

Crucial is the inclusion of Wow6432Node towards the beginning of the string.

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Custom Action: It is not accepted best practice, but I like to use custom actions to inspect the system (I don't like them for making system updates). Inspection custom actions are read-only, do not require any rollback, are not dangerous to the system and you can relatively safely suppress errors.

The reason I like inspection custom actions is that you have full flexibility if system inspection requirements get more complicated. I find AppSearch gets very confusing at times. Custom actions are not easy to use with Visual Studio Installer Projects.

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Bitness: I don't use App Search much, but is this an actual 32-bit machine (pretty vintage that) or a 64-bit machine with 32-bit components? In case of the latter, here is a reminder about the core bitness-dependent paths in the registry and on disk:

Registry:

• 64-Bit: HKEY_LOCAL_MACHINE\SOFTWARE
• 32-Bit: HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node

Disk:

• 64-Bit: C:\Program Files\
• 32-Bit: C:\Program Files (x86)\
• 64-Bit: C:\Windows\System32\ - (yes, really)
• 32-Bit: C:\Windows\SysWOW64\ - (yes, really)

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Links:

• App Search - registry locations