I program also at the same time on an IBM mainframe in PLI, a programming language which is also based in Pascal. Delphi is the only windows programming language which is based on the Pascal syntax. Copy WinHlp32.exe instead From now Delphi 7 help works fine! Cohabit fine with Delphi XE 10.x on the same machine.In security tab add your user name with full rights (when disabled, click 'Advanced' button and take the ownership over this file).Find existing WinHlp32 file and open its properties.You must have administrator's rights to do following actions: Later versions extracted from Win7/Win8 packages don't work for me. In my case I take it from my old Windows XP SP3 (32 bits). The only workaround is to copy it from an other system. For example: Unfortunately, there is no official way to install WinHlp32 on Windows Server 2012 and Windows 10.
You should download corresponding version from Microsoft web site and install it.
How to install and use Delphi 7 and help files on Windows 8/10 or Server 2012.