Can I load a DLL from a memory mapped file

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C++

Hi My question is quite simple.
Can I execute an EXE or load a DLL from memory mapped file?
This need arises for security reasons(to prevent reverse engineering).
I build an EXE or DLL, encrypt it as a whole and embed it in my application, possibly in some EXE file (as data). At run time, I decrypt it and write it to a memory mapped file and then execute exe or load dll.
Other suggestions to prevent reverse engineering also appreciated.
My EXE and DLL are built with native c++(visual studio 2010)

mr.abzadeh