Am 15.04.2020 um 15:29 schrieb Paul Moore via Cygwin:
On Wed, 15 Apr 2020 at 11:54, Csaba Ráduly via Cygwin <cygwin@cygwin.com> wrote:

On my machine, I have a

HKEY_LOCAL_MACHINE\SOFTWARE\Cygwin\setup

key, which contains a string value named "rootdir" with the date "C:\cygwin64".

Thanks, that looks more useful. I didn't think to check there as I
didn't recall having run the setup as "All users" so I assumed
everything would be in HKCU. I should have checked!
Paul
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Pay attention that Setup links to the last updated one 64 or 32bit

Computer\HKEY_LOCAL_MACHINE\SOFTWARE\Cygwin\Setup
Computer\HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Cygwin\Setup

Installations report all if more are installed (borderline case, maybe)

Computer\HKEY_LOCAL_MACHINE\SOFTWARE\Cygwin\Installations
Computer\HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Cygwin\Installations

both version 32 and 64 bit are reported on

Computer\HKEY_CURRENT_USER\Software\Cygwin\Installations

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