.H1Q File Extension
File TypeMicrosoft Help Merged Query Index File
File format categories include Binary, Text, XML, and Zip. The format of this file type has not been determined.
Query index used by Microsoft Help, a system help program included with the Windows operating system; stored in the "\Documents and Settings\All Users\Application Data\Microsoft Help" in Windows XP and the "\ProgramData\Microsoft\Assistance\Client\1.0\en-US" directory in Windows Vista.