The main menu items are not replaceable AFAIK. There used to be ways to rearrange some of them and third-party programmers could add new ones, but that was back in the good old days when there was a software development kit supplied by TomTom.
After they stopped providing that, it became almost impossible to unravel the subsequent software updates.
In short, the menu icons are hard-coded in the software and aren't in a separate file.
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