[New - Windows NT]
The CDM_SETDEFEXT message sets the default filename extension for an Explorer-style Open or Save As common dialog box. The dialog box must have been created with the OFN_EXPLORER flag; otherwise, the message fails.
CDM_SETDEFEXT
wParam = 0;
lParam = (LPARAM) (LPSTR) pszext;
// corresponding macro
void CommDlg_OpenSave_SetDefExt(hdlg, pszext)
Parameters
hdlg
Handle of the common dialog box window to receive the message.
pszext
Pointer to the new filename extension. Must not include the dot (.).
Return Values
No return value.
See Also