The file appears to be a Java Archive (JAR) file, which is commonly used for Minecraft mods. The "1.20.1" in the file name suggests it's compatible with Minecraft version 1.20.1.
Minecraft, mod, JAR file, Re Terra Forged Mod Forge file name reterraforgedmodforge1201jar
Re Terra Forged Mod Forge 1.20.1 JAR File The file appears to be a Java Archive
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