What does Windows error code 191 (ERROR_INVALID_EXE_SIGNATURE) mean?

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: Cannot run %1 in Win32 mode.

Could be also:
Constant	Type	OS
STATUS_ABANDONED_WAIT_63	NTSTATUS	Windows
MUTEX_ALREADY_OWNED	BugCheck Code	Windows

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