Why is Wireshark using .acp file extension for capture files in Windows when that extension is clearly for aacPlus audio files?

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Here is a list of file extensions wireshark uses when saving a capture file.

.acp is not among them. This looks more like a type error when the file was saved.
Statistics -> Capture File Properties will tell you more about the origin of the capture .

Regards Matthias

Because, for some unknown reason, the installers for Windows and macOS register '.acp" as a suffix for capture files that Wireshark can read, even though the Wireshark code itself doesn't include ".acp".

Please file a bug on this at the Wireshark Bugzilla.