If you are looking for WinHelp32 (to see Help files with the .hlp extension), it is not part of Windows any more, and Microsoft removed it from its website.
I have found it here
This is a link :
https://archive.org/details/winhlp-32-for-window-vista-win-7-win-8s.-7z (not mine)
It is for Windows Vista, 7 i 8
What about Window 10?
I have found on the Internet
How to read an old “.hlp file (*)” on Windows 10 (x64, or, x86)
(*): The “.hlp file” must be read, without any problem, on Windows XP, 2000, ME, or, 98/98SE.
The following is a procedure to be able to read an old “.hlp file” on Windows 10 (x86).
(1) First, get the winhlp32.exe existing in the Windows directory of Windows XP (x86).
(2) Make a temporary folder (for example D:\TEMP) on the HDD of Windows 10 (x86).
(3) Copy the winhlp32.exe (obtained by the #(1) step) into the temporary folder D:\TEMP.
(4) Make a file, named Win10-Hlp32-Fix.cmd, by using the text editor.
All of the contents of the file (Win10-Hlp32-Fix.cmd) are as follows;
@echo off
set crtpth=%CD%
takeown /f "%windir%\winhlp32.exe" >nul
icacls "%windir%\winhlp32.exe" /grant *S-1-5-32-544:F >nul
copy /y "%crtpth%\winhlp32.exe" %windir%
icacls "%windir%\winhlp32.exe" /setowner "NT Service\TrustedInstaller" >nul
echo.
echo Done.
echo.
echo Press any key to Exit
pause >nul
exit
(5) Therefore, you can find two files (winhlp32.exe and Win10-Hlp32-Fix.cmd) in the D:\TEMP.
(6) Open the Command Prompt window, by selecting "Run as administrator.”
(7) Then, move the prompt to the D:\TEMP directory, by using Change Directory (CD)command.
(
Under this condition, execute the Win10-Hlp32-Fix.cmd command in the D:\TEMP directory.
(9) After the completion of this execution, you can read an old “.hlp file” on Windows 10 (x86).
Remarks:
In the case of Windows 10 (x64), please use the winhlp32.exe existing in the Windows directory of Windows XP (x64).
from
https://www.tenforums.com/general-support/16982-cant-read-older-hlp-files-windows-10-a-11.html
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