求教有关文件扩展名的问题！高手请进！

[艾德]

要可编辑的文档/视图程序中要如何才能使已编辑的文件保存时有二种以上的扩展名？

[guoyin]

BOOL CXXXApp::InitInstance()
{
...
CMultiDocTemplate* pDocTemplate;
pDocTemplate = new CMultiDocTemplate(
IDR_XXXTYPE,
RUNTIME_CLASS(CXXXDoc),
RUNTIME_CLASS(CChildFrame), // custom MDI child frame
RUNTIME_CLASS(CXXXView));
AddDocTemplate(pDocTemplate);

pDocTemplate = new CMultiDocTemplate(
IDR_XXXTYPE1,
RUNTIME_CLASS(CXXXDoc),
RUNTIME_CLASS(CChildFrame), // custom MDI child frame
RUNTIME_CLASS(CXXXView));
AddDocTemplate(pDocTemplate);
....
}

IDR_XXXTYPE=\nTest\nTest\nTest Files (*.tst)\n.tst\nTest.Document\nTest Document
IDR_XXXTYPE1= \n\n\nData Files(*.dat)\n.dat