There is two folders, each holds the different versions.
For 32Bits: ...Crysis Wars\Bin32\Crysis.exe"-mod MWLL
For 64bits: ...Crysis Wars\Bin64\Crysis.exe"-mod MWLL
If you are using the Steam version, you will need to add it as a non-Steam game shortcut for the 64bits, unless there is other ways that I do not know. Not that it good to play MechWarrior: Living Legends, only to call it Crysis Wars.