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Editorial Team
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Asked: 2026-06-15T06:19:08+00:00

I am using NSIS to create an application installer which consists of multiple programm

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I am using NSIS to create an application installer which consists of multiple programm installation files, mainly .exe and .msi files.

Now I have the problem that I have a very old setup file which only works properly if I set the compatibility to Windows ME/98. Usually the Users which will run the installation don’t have the ability to run the whole installation package in compatibility mode.

Is there a command in NSIS to execute such a sub-setup in a specific compatibility mode?

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1 Answer

  1. Editorial Team

    You can set __COMPAT_LAYER to Win98: 

    System::Call 'Kernel32::SetEnvironmentVariable(t "__COMPAT_LAYER", t "Win98")'
ExecWait '"$instdir\foo.exe"'
System::Call 'Kernel32::SetEnvironmentVariable(t "__COMPAT_LAYER", i 0)'
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