MS Help Viewer

Help Viewer 1.x is the help system for VS 10 (VS 2010),
  • HV1 Info -- Deep info on HV1 (and HV2 file format)
  • H3Viewer.exe - Helpware alternative viewer for HV1 help
Help Viewer 2.x is the help system for VS 11 (VS 2012) and Windows 8 Help.
Note: Both HV1 and HV2 have the same .mshc help file format, however the help runtime code and APIs are very different.