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m_pszHelpFilePath is a public member of CWinApp, so it can be changed anytime in a program. For that reason using it to extract the application path isn't reliable.
Much better is to use...

...besides, the "Program Files" special folders may be different not only in different Windows languages distributions, but also in different Windows versions. So, again, as Victor kindly suggested,...

Sorry, Ralf, Windows is never confused, except case you've provided a hard-coded path "Programme" instead of "Program Files" (or vice versa).
Calm down and read again the answer that Victor kindly...