Writing a HELP for a windows program

See more:

C++

I am sorry of this is off-topic, but when I have written a C++ program for Windows, it then sometimes needs a HELP file.

I have been writing Windows computer programs since the 1970's. Then, a help was s file in a special text mode with a name ending in .HLP . I found a helpmaker program, and it worked, and I was content with that.

Then Microsoft stopped using and supporting that old .HLP mode of help files, this making useless several *.HLP files that I had made for Windows programs that I had written. Now, I have to write help files in plain text, or in Word for Windows.

I have seen modern Windows applications that have help files that operate somewhat like the old help files. Please, where is a helpmaker program that lets a user make that new sort of help files? One such mode is *.chm, described in Windows Explorer's directory lists as "Compiled HTML Help file".

What I have tried:

I asked about and got no luck.