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Can't get IIS Express 8 beta to run website as 64-bit process

Asked 2012-04-18T02:38:47.023
55

on x64 Windows 7 I am trying to get hello world MVC 3 website running as 64-bit process (so Environment.Is64BitProcess returns true on a page) using IIS Express 8 latest beta.

IIS Express 7.5 is 32 bit but IIS Express 8 does support 64 bit (http://learn.iis.net/page.aspx/1266/iis-80-express-beta-readme/).

Can't get any 64-bit love.

Building AnyCpu returns Is64BitProcess false, building x64 gives "An attempt was made to load a program with an incorrect format. " as if it was trying to run as 32-bit process.

Experiments w/ renaming folders etc. suggest that "C:\Program Files (x86)\IIS Express" is only thing that is getting used, and "C:\Program Files\IIS Express" is being ignored by VS.

How can I get VS to use the x64 IIS Express host?

64-bit iis-express
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3 Answers

3

In the registry, go to HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\IISExpress\8.0\InstallPath and change the path to the 64-bit iisexpress.exe location.

answered 2013-01-28T15:40:27.813
2

You can run IIS Express in 64 bit mode from the command line, and then use VS "attach to process" to debug.
See this question.
Have fun.

answered 2012-09-12T04:03:10.697
-2

In order to solve this on my system, I cheated -- I copied the 64-bit executables (in \Program Files\IIS Express\) over the 32-bit executables (in \Program Files (x86)\IIS Express\). Visual Studio doesn't seem to care whether it's one or the other.

I guess we will have to wait and see if the final release of VS 2012 will allow for choosing between the 32-bit and 64-bit IIS Express.

answered 2012-07-01T00:57:24.367

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