The compiler help file is a true Win32 help file. It is not compatible with the windows 3.1 version of WinHelp. The program winhelp.exe delivered with Windows 3.1, Windows 95 and Windows NT can only open Windows 3.1 help files. To open the compiler help file, use Winhlp32.exe.
The winhlp32.exe program resides either in the windows directory (usually C:\windows) or in its system (Win32s) or system32 (Windows 2000, Windows XP, or Windows Vista operating systems) subdirectory. The Win32s distribution also contains Winhlp32.exe.
To change the association with Windows either (1) use the explorer menu View>Options and then the File Types tab or (2) select any help file and press the Shift key. Hold it while opening the context menu by clicking on the right mouse button. Select Open with from the menu. Enable the Always using this program check box and select the winhlp32.exe file with the "other" button.
To change the association with the file manager under Windows 3.1 use the File>Associate menu entry.