Opening HTML file in browser where HTML is in same directory as executable

I created a bunch of HTML help files, and now I would like to have a browser window open when I click on the Help button.  I tried ShellExecute, and it works when I give it a URL like "C:\blah\index.htm", but I want it to open index.htm that resides in the same directory as the executable that is running.  I tried just "index.htm" and ".\\index.htm" in the ShellExecute command, but to no avail.  Can someone help me out?
tarlochanDAsked:
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chensuConnect With a Mentor Commented:
// get the full path name of a file that is in the same
// directory as this executable file
TCHAR pszFullPathName[MAX_PATH];

// get the full path name of the executable file
::GetModuleFileName(NULL,
                    pszFullPathName,
                    sizeof(pszFullPathName) / sizeof(TCHAR));

// get the address of the filename portion of the full path
LPTSTR lpszFileName;  // point to the filename portion of the full path
::GetFullPathName(pszFullPathName,  // filename
                  sizeof(pszFullPathName) / sizeof(TCHAR),
                  pszFullPathName,  // path
                  &lpszFileName);
   
// replace the filename portion with the desired filename
::lstrcpy(lpszFileName, _T("index.htm"));

::ShellExecute(hWnd, NULL, pszFullPathName, NULL, NULL, SW_SHOWNORMAL);
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