In the short term, you can return to the file using an alternative coding system using revert-buffer-with-coding-system (then select utf-16le).
Average, you can increase the priority of this utf-16le encoding when booting with prefer-coding-system .
In the long run, you should try to understand why emacs did not choose the correct encoding. I am not sure how I can help there, although I donβt need to dig inside the gut of the coding system or at least have a file to play.
EDIT: Does this file have a BOM ?
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