Segmented Hypergraphics

Segmented Hypergraphics (SHG), and its alter-ego Multiple Resolution Bitmap (MRB) format, are graphics formats associated with HLP (WinHelp) format. An SHG/MRB file contains one or more images in a BMP-like format, or WMF format. It also contains information about regions of the images that should be treated as hyperlinks.

The only technical difference between SHG and MRB appears to be that there is sometimes a one-bit difference in the header.

Identification
SHG files begin with.

MRB files should begin with. However, some of them use the SHG signature instead.

Specifications

 * helpdeco → helpfile.txt has information based on reverse-engineering.
 * SHG and MRB File Format
 * SHED.ZIP - "a rather questionable specification"
 * Windows Undocumented File Formats - 1997 book by Pete Davis, Mike Wallace

Software

 * helpdeco → splitmrb

Links

 * Wikipedia: Segmented Hyper Graphics
 * Using Graphics Within a Help File