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>> H1W file

H1W file format description

Many people share .h1w files without attaching instructions on how to use it. Yet it isn’t evident for everyone which program a .h1w file can be edited, converted or printed with. On this page, we try to provide assistance for handling .h1w files.

1 filename extension(s) found in our database.

.h1w - Microsoft Help Merged Keyword Index

H1W file is a Microsoft Help Merged Keyword Index. Microsoft Help is a system assistance program included with Microsoft Windows.

.h1w file format description:
H1W format description not yet available
Microsoft Windows Help
Data files
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Microsoft Help Merged Keyword Index related links:
Microsoft Help Merged Keyword Index related extensions:
Windows Help Bookmark
Microsoft Help Collection Definition
Microsoft Help Validator File
Microsoft Help Merged Hierarchy File
Microsoft Help Keywords Index
Microsoft Help Merged Query Index

Naturally, other applications may also use the .h1w file extension. Even harmful programs can create .h1w files. Be especially cautious with .h1w files coming from an unknown source!

Can't open a .h1w 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 .h1w file extension is often given incorrectly!

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

h1d, hlw, h1q, hw, h1s

Is it possible that the filename extension is misspelled?

Similar file extensions in our database:

Microsoft Help Validator File
Microsoft Help Merged Query Index
Microsoft Help Compiled Help Data
Hioki Logger Communicator Waveform Data
Marvelous Designer Hardware ID Data

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