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ERROR_WOW_ASSERTION
What ERROR_WOW_ASSERTION means
WOW components bridge applications built for a different Windows execution environment, most commonly 32-bit processes on 64-bit Windows. An assertion means the compatibility layer encountered state it did not expect.
Where it appears
- legacy 32-bit application startup or shutdown
- thunking between 32-bit code and 64-bit system services
- installers, shell extensions, injected modules, and compatibility shims
Likely causes
- unsupported assumptions in old binaries
- third-party DLL injection or hooks
- corrupted process state or invalid cross-boundary structures
- an operating-system compatibility defect
Evidence to collect
- process architecture and exact failing executable
- loaded DLL list with bitness and signatures
- application compatibility settings and shims
- crash dump showing the WOW transition frames
How to respond
First remove injectors, overlays, and obsolete compatibility settings. Test the current application build on a fully patched system. A vendor should inspect the dump and replace unsupported cross-bitness behavior rather than suppressing the assertion.
Diagnostic interpretation
For this particular status, the decisive evidence is process architecture and exact failing executable, loaded DLL list with bitness and signatures. Those details separate the documented condition from unrelated failures that happen to occur nearby.
Record the numeric code together with the symbolic name ERROR_WOW_ASSERTION, the API or subsystem that produced it, and the first preceding failure. A later cleanup occurrence may describe a consequence instead of the initiating defect.
Example
A diagnostic trace records this result after an operation changes subsystem state. The result investigation should follow the first state-changing call, validate its resulting state, and classify later cleanup messages as secondary evidence.
Implementation guidance
Code handling this result should distinguish a terminal failure from a warning, progress indication, or request to repeat after a defined state change. When handling it, preserve handles and output fields only where the originating API explicitly keeps them valid. The path needs bounded retries and cleanup that tolerates partial initialization.
Validation after remediation
Repeat one controlled operation that previously produced this result. Verify both disappearance of the status and completion of the specific state transition described above. Adjacent messages around it must also be reviewed so a fallback is not mistaken for a complete repair.
References
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