HWP

File Format
Name	HWP
Ontology	Electronic File Formats Document Word Processor HWP ; ; ; ;
Extension(s)	.hwp
PRONOM	fmt/1083, fmt/1084
Wikidata ID	Q2875795
Released	1989

HWP is Hancom Word's file format, and is based on Microsoft's OLE compound document format.

A specification was released in 2010, but it is in Korean only.

References

Questions on POLE library (and HancomWord support) Provides basic info on the format.
[1] Further post in the thread, linking to the specification download page, and telling how to download and extract it properly.

File Format
Name	HWP
Ontology	Electronic File Formats Document Word Processor HWP
Extension(s)	`.hwp`
PRONOM	fmt/1083, fmt/1084
Wikidata ID	Q2875795
Released	1989