How to start a 64-bit process from a 32-bit process

.net process 32bit-64bit syswow64
Igor Zevaka picture Igor Zevaka · Jan 5, 2010 · Viewed 27.2k times · Source

I am trying to run a 64 bit executable (java.exe) from our 32-bit .NET application. I am using Process class and invoking cmd /c <command name> in order to support all possible commands (like dir, cd etc).

The problem is that on my machine I installed 64-bit version of JRE and java.exe is only available from C:\Windows\System32 folder (x64). I have tried explicily starting 64 bit version of cmd.exe by calling C:\Windows\System32\cmd.exe but it gets redirected to SysWOW64 due to calling process being 32 bit.

Is there anything else I can do to get this to work?

EDIT The whole cmd /c thing is a bit of a red herring. It is not part of the problem, being able to run 64 bit executables is.

Answer

Michael picture Michael · Jan 5, 2010

You can temporarily disable filesystem redirection around the call to Process.Start, the appropriate API's to P/Invoke are Wow64DisableWow64FsRedirection and Wow64RevertWow64FsRedirection.

Another option is to use %windir%\sysnative, which is available on Windows Vista and above.

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