afxdlgs.h

// Classes declared in this file

	// CDialog
		class CCommonDialog;  // implementation base class

			// modeless dialogs
			class CFindReplaceDialog; // Find/FindReplace dialog

			// modal dialogs
			class CFileDialog;    // FileOpen/FileSaveAs dialogs
			class CColorDialog;   // Color picker dialog
			class CFontDialog;    // Font chooser dialog
			class CPrintDialog;   // Print/PrintSetup dialogs
#if WINVER >= 0x0500
			class CPrintDialogEx;   // Windows 2000 Print dialog
#endif //(WINVER >= 0x0500)
			class CPageSetupDialog; // Page Setup dialog

	// CWnd
	class CPropertySheet;     // implements tabbed dialogs

	// CDialog
		class CPropertyPage;  // Used with CPropertySheet for tabbed dialogs

与此 afxdlgs.h 有关的是：

dlgcomm.cpp

dlgclr.cpp

另 CDialog 的声明在afxwin.h 实现在 dlgcore.cpp