OSDev.org

The link is a binary PE file for the i386 platform.
Written for Windows operating systems since 95.
To access the source code, simply disassemble the binary file.

https://github.com/Alexey1994/fastest-8086

So, what makes you think anyone is going to run a random EXE? Especially one that is called “the fastest assembler in the world” lol. This is very fishy. Where is the source code?

And who needs an 8086 assembler that just emits raw binary?