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0x00000261

ERROR_BAD_DLL_ENTRYPOINT

{Invalid DLL Entrypoint} The dynamic link library %hs is not written correctly.

win32decimal 609

Matched as: the code as given (hex)

{Invalid DLL Entrypoint} The dynamic link library %hs is not written correctly. The stack pointer has been left in an inconsistent state. The entrypoint should be declared as WINAPI or STDCALL. Select YES to fail the DLL load. Select NO to continue execution. Selecting NO may cause the application to operate incorrectly.

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Source: System Error Codes (500-999) - Win32 apps · CC-BY-4.0 (MicrosoftDocs/sdk-api, repo license verified 2026-10-09) · retrieved 2026-10-09