CHQ file format description

Many people share .chq files without attaching instructions on how to use it. Yet it isn’t evident for everyone which program a .chq file can be edited, converted or printed with. On this page, we try to provide assistance for handling .chq files.

1 filename extension(s) found in our database.

.chq - Help Combined Full-text Search

The CHQ data files are related to WinHelp. The CHQ file is a Help Combined Full-text Search File. The WinHelp seems to be no longer supported.

Data files
- / -
Help Combined Full-text Search related extensions:
Windows Help Annotations
Windows Help File

Naturally, other applications may also use the .chq file extension. Even harmful programs can create .chq files. Be especially cautious with .chq files coming from an unknown source!

Can't open a .chq file?

When you double-click a file to open it, Windows examines the filename extension. If Windows recognizes the filename extension, it opens the file in the program that is associated with that filename extension. When Windows does not recognize a filename extension, you receive the following message:

Windows can't open this file:


To open this file, Windows needs to know what program you want to use to open it. Windows can go online to look it up automatically, or you can manually select one from a list of programs that are installed on your computer.

To avoid this error, you need to set the file association correctly.

The .chq file extension is often given incorrectly!

According to the searches on our site, these misspellings were the most common in the past year:

cbq, ch, cq, fhq, hq

Is it possible that the filename extension is misspelled?

Similar file extensions in our database:

CQUAL Configuration
CP/M SYSGEN Replacement Data
Family Historian Query
StarOS Class Based Queuing Script
Apple ProRes 422 HQ Video
CA-Clipper Clipper Header

Operating systems currently supports the following operating systems:

Windows XP/Vista, Windows 7/8/10, Windows 11, CentOS, Debian GNU/Linux, Ubuntu Linux, FreeBSD, macOS, Mac OS X, iOS, Android

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If you have useful information about the .chq file format, then write to us! >> CHQ file