HtmlHelp function not working, not opening help file behind a vb button

I am in vb6, behing a button i have put this code: hwnd is populate correctly. but no help file opens. what could开发者_运维技巧 be wrong. the path "D:\software\src\mysoft.chm" opens the help file when i do it from start\run.

 abc = "D:\software\src\mysoft.chm"
        HtmlHelp hWnd, abc, HH_HELP_CONTEXT, topic

---

found it, the topic in the chm file was erroneous. The chm file needed to be corrected because changing the topid id opened the chm file