Those two code pages are unrelated.

A Windows process's code pages:

Code PageUse
GetACP()"A" Windows API functions
Only used by file APIs if AreFileApisANSI() is true.
GetOEMCP()?
Used by file APIs if AreFileApisANSI() is false.
GetConsoleCP()For (keyboard) input of console apps
GetConsoleOutputCP()For (displayed) output of console apps

Update: Added the second section.

In reply to Re^2: confusing result from Win32::GetACP() by ikegami
in thread confusing result from Win32::GetACP() by hexcoder

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