# MSTest x64

**URL:** https://www.finalbuilder.com/forums/t/mstest-x64/5405
**Category:** Discussion
**Created:** [September 16, 2015, 7:08am UTC](https://www.finalbuilder.com/forums/t/mstest-x64/5405 "2015-09-16T07:08:14Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![michael.jelich](https://www.finalbuilder.com/forums/letter_avatar_proxy/v4/letter/m/c57346/32.png) [@michael.jelich](https://www.finalbuilder.com/forums/u/michael.jelich)
#### Post date: [September 16, 2015, 7:08am UTC](https://www.finalbuilder.com/forums/t/mstest-x64/5405/1 "2015-09-16T07:08:14Z")

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Hi Support Team,  
  
I have added a MSTest action to my ContinuaCI project in order to perform UnitTests.  
  
One test always fails. The reason is, that this specific test loads a 64 bit DLL. Therefore it has to run in 64 bit mode.   
  
How can I start 64 bit tests?  
  
Best regards  
Michael

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### Author: ![Sparky](https://www.finalbuilder.com/forums/user_avatar/www.finalbuilder.com/sparky/32/10_2.png) [@Sparky](https://www.finalbuilder.com/forums/u/Sparky)
#### Post date: [September 17, 2015, 6:16am UTC](https://www.finalbuilder.com/forums/t/mstest-x64/5405/2 "2015-09-17T06:16:11Z")

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Hi Michael,  
  
MSTest will not run on mixed-mode assemblies and there is no command line option we can use. You can workaround this problem by setting the target platform for your main test project to x64 instead of Any CPU.&nbsp;  
  
See&nbsp;[this article](http://rupertrawnsley.blogspot.com.au/2011/04/mstest-and-64bit.html)&nbsp;for more details and other possible options.