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It's easier to check Magic of Optional HeaderOptional Header magic number.
For a valid exe, only two values are possible:
0x10B -=> PE32 -=> 32 bit 0x20B -=> PE32+ -=> 64 bit
It's easier to check Magic of Optional Header.
0x10B - PE32 - 32 bit 0x20B - PE32+ - 64 bit
It's easier to check Optional Header magic number.
0x10B => PE32 => 32 bit 0x20B => PE32+ => 64 bit
