CODEWITHSUNDEEP
32-bit
Chen weida
Chen weida

Reputation: 1

How the computer system identify the application is 32-bit or 64-bit

As we know, the 64-bit system (like windows) can run both 32-bit applications or 64-bit applications. Under Windows 64-bit, 32-bit applications run on top of an emulation of a 32-bit operating system that is called Windows 32-bit on Windows 64-bit, or WOW64 for short.

Here, I want to know, how can the 64-bit system knows the application is 32-bit or 64-bit? So, the windows 64-bit or WOW64 can be chose to run the application correctly.

Upvotes: 0

Views: 35

Answers (1)

LeleDumbo
LeleDumbo

Reputation: 9340

By examining Machine field of the COFF header.

Upvotes: 1

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