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ERROR_SEGMENT_NOTIFICATION
What ERROR_SEGMENT_NOTIFICATION means
A virtual DOS machine reported loading, unloading, or moving a 16-bit program segment. In practical terms, this status belongs to legacy VDM debugging: the subsystem notifies a debugger so symbols and breakpoints can follow a DOS or Win16 segment.
Typical causes
- A 16-bit module loaded or unloaded
- A movable segment changed its address
- A debugger attached to a legacy compatibility environment
How to investigate
- Capture the segment selector, module identity, and load or unload action
- Check whether the environment actually supports NTVDM
- Treat the notification as debugger metadata rather than a modern application error
Developer guidance
This status is relevant mainly to legacy 16-bit debugging. On modern 64-bit Windows, absence of NTVDM may be the more important compatibility limitation.
References
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