VCType : It features MDI ProgramWhen the mode dialog box is opened (for example, the file dialog box is opened), the file that is double-clicked in resource manager is not opened;
UltraeditType : It features MDI When the program opens the mode dialog box, the file that is double-clicked in resource manager is still opened;
WordType : It features MDI when the mode dialog box is opened, the file double-clicked in resource manager is not opened. When the mode dialog box is closed, the file double-clicked in resource manager is opened.
---- there are three main points to implement this function:
---- <1> How to notify a running instance that a file is to be opened;
---- <2> how to know whether a running instance has enabled the mode dialog box;
---- <3> how to pass the file name double-clicked in resource manager to a running instance.
