NSIS: How check that application is installed

Question

I need to check if Microsoft filter pack 2.0 application is installed. I found this answer, but in my case I haven't the Application name, instead the name directory with program in registry named as {95140000-2000-0409-1000-0000000FF1CE} Here is my code to detect for installed app:

ReadRegStr $0 HKLM "Software\Microsoft\Windows\CurrentVersion\Uninstall\${FILTER_PACK_KEY}" "UninstallString"
IfErrors FilterPackNotFound FilterPackFound

Have you defined FILTER_PACK_KEY? What is the problem, is it not detecting or are you getting false positives? — Anders, Feb 05 '19 at 12:10
@Anders Yes I have a key, but it's not detecting anithing and this code return empty string in messageBox: `ReadRegStr $0 HKLM "Software\Microsoft\Windows\CurrentVersion\Uninstall\95140000-2000-0409-1000-0000000FF1CE" "InstallDate" MessageBox MB_OK "NSIS is installed at: $0"` — user2455111, Feb 06 '19 at 03:27
this case also doesn't work: `"Software\Microsoft\Windows\CurrentVersion\Uninstall\{95140000-2000-0409-1000-0000000FF1CE}"` — user2455111, Feb 06 '19 at 03:31

score 1 · Accepted Answer · answered Feb 06 '19 at 03:58

The registry on 64-bit Windows has two "views" and 32-bit applications access the 32-bit view by default.

NSIS can access the 64-bit view by using the SetRegView instruction:

Section
SetRegView 64
RegReadStr $0 HKLM "Software\Microsoft\Windows\CurrentVersion\Uninstall\{95140000-2000-0409-1000-0000000FF1CE}" "UninstallString"
SetRegView 32
MessageBox mb_ok $0
SectionEnd

NSIS: How check that application is installed

1 Answers1