chm is a help format document. CHM is the abbreviation of "Compiled Help Manual" in English, that is, "compiled help file". It can be opened using hh.exe that comes with Windows.
1. Select the file with the extension .chm, right-click "Properties", and click the "Change" button in the pop-up properties window.
2. Select "Browse" in the pop-up window
3. Enter the c drive and find it in the pop-up window And select hh.exe.
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