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how do I rename *.3gp.mp4 to *.mp4?

so e.g. aaa.3gp.mp4 should be aaa.mp4

E:\blah>rename *.3gp.mp4 *.mp4

E:\blah>move *.3gp.mp4 *.mp4
The filename, directory name, or volume label syntax is incorrect.

E:\blah>

none of those commands are renaming the files.

Use FOR loops and the format specifiers of FOR variables. Remove the ECHO if it outputs the right commands.

Steffen