C / C++ / MFC

class AFX_EXT_CLASS CYourClass : public CSomething
{
// ...
};

class YOUR_SPECIAL_MACRO CYourClass : public CSomething
{
// ...
};

#ifdef YOURLIB_IS_STATIC
#define YOUR_SPECIAL_MACRO
#else
#define YOUR_SPECIAL_MACRO AFX_EXT_CLASS
#endif

ShowWindow(SW_MINIMIZE);

int viRes = (int)ShellExecute(GetSafeHwnd(), "open", "my_file_to_read.txt", NULL, "C:\\Temp", SW_SHOW );
if (viRes == SE_ERR_NOASSOC)  // The user has no associated viewer for ".txt"
{
	STARTUPINFO			vtStartupInfo;
	PROCESS_INFORMATION	vtProcessInfo;
	CString				vcstrCommand;
	CString				vcstrParams;
	DWORD				vdwLen;

	vdwLen = GetWindowsDirectory(vcstrCommand.GetBuffer(_MAX_PATH), _MAX_PATH);
	vcstrCommand.ReleaseBuffer(vdwLen);

	vcstrCommand += "\\Notepad.exe";
	vcstrParams = vcstrCommand + " ";
	vcstrParams += m_cstrLogFilename;

	memset(&vtStartupInfo, 0, sizeof(vtStartupInfo));
	vtStartupInfo.cb = sizeof(vtStartupInfo);
	if (!CreateProcess(vcstrCommand, vcstrParams.GetBuffer(vcstrParams.GetLength()), NULL, NULL, FALSE, NORMAL_PRIORITY_CLASS, NULL, NULL, &vtStartupInfo, &vtProcessInfo))
	{
		vcstrParams.ReleaseBuffer();
		CString	vcstrMsg;
		vcstrMsg.Format("The logfile \"%s\" could not be opened using Notepad.", (LPCTSTR)m_cstrLogFilename);
		AfxMessageBox(vcstrMsg);
	}
	else
		vcstrParams.ReleaseBuffer();
}
else if (viRes < 32) // ShellExecute returns < 32 to indicate an error.
{
	CString	vcstrMsg;
	vcstrMsg.Format("The logfile \"%s\" could not be opened using your default viewer.", (LPCTSTR)m_cstrLogFilename);
	AfxMessageBox(vcstrMsg);
}