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This project also happens to be a reasonable example of how to process output and error streams correctly using C. https://github.com/mpderbec/WinTee
You might be able to find all the gory details and kinky stuff here or maybe here if you're not faint of heart..
It's likely a binary file that's improperly being interpreted as Unicode by the text editor. If it's an executable file, you can use Ghidra to disassemble and analyze it. There may also be some interesting ASCII strings that would reveal its purpose. My guess is that it's a Windows version of Unix "tee" program which will write stdin to a file and stdout simultaneously.
This thread has already been answered, but in the future you can use exiftool to identify files with no extension.
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