CHW file format description

Many people often share .chw files without providing instructions on how to use them. This can make it difficult for users to determine which program is compatible for editing, converting, or printing .chw files. To address this issue, we have created this page to offer assistance and guidance on handling .chw files. We provide information on compatible software, editing instructions and conversion options to help users effectively interact with .chw files.

Our aim is to simplify the process and promote seamless use of the .chw file format.

1 filename extension(s) found in our database.

.chw - Compiled HTML Help Index

The CHW data files are related to Microsoft Office Resource Kit. The CHW file is a Compiled HTML Help Index. HTML Help is the standard help system for the Windows platform. The HTML Help compiler (part of the HTML Help Workshop) makes it possible to compress HTML, graphic, and other files into a relatively small compiled help (.chm) file.

Application:Microsoft Office Resource Kit
Category:Data files
Magic:- / -

Compiled HTML Help Index related extensions:

  • k3y USB Raptor Password Data
  • fbfileset FileBoss File Sets Data
  • bms Backup Magic Backup Set
  • vms Dreamcast VMU Save File
  • itp GROMACS Include Topology
  • elt NEPLAN Topology Data

Be careful.

It is important to understand that the .chw file extension is not limited to a particular set of applications. Other programs besides the intended ones can also use the .chw extension to create files. This includes potentially harmful programs or malware that may generate .chw files for various purposes. Be especially cautious with .chw files coming from untrusted or unknown sources.

Can't open a .chw 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 an extension, you receive the following message:

Select an app to open this .chw file

To set the .chw file association in Windows 11, you can follow these steps

  1. Open the Settings app by clicking on the Start menu and selecting the gear icon.
  2. In the Settings app, click on System and then select Apps from the left-hand side menu.
  3. Scroll down and click on the Default apps option.
  4. Under the Default apps section, you will find various categories such as Email, Web browser, and Music player.
  5. Locate the category that matches the file type you want to associate, such as Photos for image files or Video player for video files.
  6. Click on the current default app listed under the category. A list of available apps will appear.
  7. Choose the app you want to set as the default for that file type. If the desired app is not listed, click on More apps to see additional options or click on Look for an app in the Microsoft Store to search for apps in the Store.
  8. After selecting the app, it will become the default choice for opening files of that type.

It's worth mentioning that you don't always need to set .chw file association. Many applications can open .chw files without requiring any specific file association to be set.

The .chw file extension is often given incorrectly

Based on searches conducted on our site in the past year, we have compiled a list of the most common misspellings. These frequent misspellings can cause confusion and hinder search accuracy. Our goal in providing this list is to help users find the right information more easily and enhance their overall search experience on our website.

These misspellings were the most common in the past year:

cbw, ch, cha, chd, che, chq, chs, cmw, cnw, ctw, cuw, cw, dhw, hcw, hw

Is it possible that the filename extension is misspelled?

There is a possibility that the .chw filename extension is misspelled. To assist users in identifying potential errors, we provide a list of similar file extensions in our database.

Filename extensions similar to .chw:

Operating systems

At, we strive to provide a seamless user experience by ensuring compatibility with a wide range of operating systems. The following is a comprehensive list of the operating systems currently supported by

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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The verification conducted by the team ensures that the information presented is accurate, reliable, and thoroughly researched. Users can rely on as a trusted source of information, knowing that their team's dedication to verification and quality control provides a dependable resource for staying informed. is not liable for the content and accuracy of external links, even if we exercise careful control over them.

If you find the information on this .chw page useful, please feel free to link to this page. >> CHW file