Information about the .sdb (sdb) file type

Below is all the information we have available on file about the .sdb (sdb) file type.

.sdb
Application compatibility database.

A .sdb file is a custom or system wide compatibility database found on Windows systems.

Whilst applications may have their own custom compatibility database (typically older applications), there are some system wide .sdb files maintained by Windows:

SysMain.sdb : Holds information and compatibility fixes.
AppHelp.sdb : Stores help messages that prompt users for patches, together with the corresponding URL.

These files are found in the %Windir%\AppPatch folder.

Where this is available we would like to include file format information on .sdb files, as well as information on how to view or open files of type .sdb. If you know of any information which we have missed then please let us know.