What do you want to do with it? I do not think you can do this directly.
Assuming you used Ngen to create your own image, the cache of your own image should be in some way, for example
C:\Windows\assembly\NativeImages_v4.0.30319_32\
The exact path depends on the version of the framework and, possibly, on some other factors, and I do not think that you have a guarantee that it will always be there. If you find your own image, you can use the disassembler to view the machine code.
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