Calling a help function from a windows program

Several years ago I wrote a Windows program that ran under XP. It has an extensive set of help topics, but it uses the old windows help format. I want to update that program to run under Windows 7 and up, but the old-style help format is no longer supported by Windows. How does one display a help topic now?
Thanks, codewalker. This was exactly what I was looking for.
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