I was recently plagued by this message whenever wanted to read .chm files. And since the only useful documentation published by the vendors of the CMS I’m currently developing for is in .CHM files, it was getting to me quick.
Luckily Google prevailed yet again and gave me this result on my query:
in which my solution was found:
Open a CMD window, type the following on the command line:
You will receive a success message after each of these commands.
thank you “Perk” from Mölnlycke, SE, for making my day!