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For a Windows Explorer shell extension that has a UI similar to "New / [file type]", i am looking for a possibility to automatically ente rename mode for the file being created.

Context menu handler and creating the intended file with a default name works fine. However, I have no idea how to programmatically enter rename mode.

(except sending keystrokes. You didn't want to recommend sending keystrokes, did you?)

Register your function/module to change the filename:

HKEY_CLASSES_ROOT\.<YourExtension>\ShellNew\command = <YourEXE> or <RUNDLL32.dll <YourDLL>, <YourDLLFunction>> "%1"

// modify file new exe

const char* CreateANewFileName(const char* old,char* buffnew,unsigned int buffsize)
	// do anything
	return buffnew;

int FAR PASCAL WinMain(HINSTANCE,HINSTANCE,char* filename,int)
	char	newfile[0x1000];
	if(filename && *filename)
	return 0;

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Create an edit control (as window) on the place of the file name and then rename the file after your operation.
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