Consider the following powershell script:


If I run this directly inside powershell on a 64bit machine, then I correctly get


But when I wrap this inside a self-extracting installer using Inno Setup (that is built on a 32bit machine) I always get:


How do I make sure powershell is running in 64bit mode when on a 64bit computer (and 32bit for 32bit computer)?

I have also tried executing a batch file which calls the powershell script, assuming that the system would start powershell in its default mode, but this also doesn't work.

I have also tried iexpress to wrap the program, same problem.

  • Your going about this problem the wrong way. Create two setups one 32-bit one 64-bit then dont worry about what platform since you will already know the platform – Ramhound Jun 17 '16 at 1:31
  • Have you tried checking the registry? According to this answer ( superuser.com/questions/290906/… ) you can check the value of "HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\BuildLabEx" – Curtis Jun 17 '16 at 1:54
  • It may be more useful to check, if you still wish to be checking for this, in the registry as @Curtis mentioned. – root Jun 17 '16 at 17:16

If your installer is a 32bit Application, it will always start a 32bit PowerShell. Even using the full path:


because the Windows File system redirector will change it to C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe

to start a 64bit PowerShell from a 32bit process, use:


on a 32bit machine, the same command should still execute the 32bit PowerShell, but I can't test that anymore.

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