| 1. | .hx | Cross-reference hash file (THOR database) |
| 2. | .hxm | Alternate Protocol Selection menu for all users (Procomm Plus) ◊ HAM extension (Descent 2) |
| 3. | .hxx | C++ header |
| 4. | HxA | MS Help 2 Files Attribute Definition File Defines topic attributes and filter definitions. |
| 5. | HxC | MS Help 2 Files Collection Definition File. Identifies all other key files and compiler options. Defines navigation data monikers. |
| 6. | HxE | MS Help 2 Files Sample Definition File Optional file for defining samples. |
| 7. | HxF | MS Help 2 Files Include File Lists all files to be included in the compiled HxS help file. Supports *.*, *.HTM, *.HTML type syntax. |
| 8. | HxK | MS Help 2 Files Index Defn File (Internal Name=K) KLinks. Keyword Index appear in the viewers Index navigation control. Typically named "K". ◊… 0.6 KB |
| 9. | HxT | MS Help 2 Files TOC Definition File Table of contents definition file. |
| 10. | HxV | MS Help 2 Files Virtual Topic Definition File(s) Virtual topic feature provides a way to treat any URL (web, pdf, image etc) as a help topic. |
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