OPENFILENAME ofn;       // common dialog box structure
char szFile[ 260 ];       // buffer for file name
HWND hwnd;              // owner window
HANDLE hf;              // file handle

// Initialize OPENFILENAME
ZeroMemory(&ofn, sizeof(OPENFILENAME));
ofn.lStructSize = sizeof(OPENFILENAME);
ofn.hwndOwner = hwnd;
ofn.lpstrFile = szFile;
ofn.nMaxFile = sizeof(szFile);
ofn.lpstrFilter =  "All\0 *.*\0Text\ 0 *.TXT\ 0 ";
ofn.nFilterIndex =  1 ;
ofn.lpstrFileTitle = NULL;
ofn.nMaxFileTitle =  0 ;
ofn.lpstrInitialDir = NULL;
ofn.Flags = OFN_PATHMUSTEXIST | OFN_FILEMUSTEXIST;

// Display the Open dialog box. 

if (GetOpenFileName(&ofn)==TRUE) 
    hf = CreateFile(ofn.lpstrFile, GENERIC_READ,
         0 , (LPSECURITY_ATTRIBUTES) NULL,
        OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL,
        (HANDLE) NULL);