An .amxx file contains a header and a code section.

Just to clarify a few important points:

Reverse Engineering in Game Development: A Technical Analysis of AMXX to SMA Decompilation Methodologies

: You lost your original source code and need a reference to rewrite specific functions.

If you lost your own source code, these tools are a lifesaver, but be prepared to spend hours cleaning up the code. If you are trying to steal/rip someone else's plugin, be aware that the code you get will be ugly, hard to modify, and potentially incomplete.

For the most current tools or updates on decompilers or converters, you might want to check:

: Often cited as the most robust choice, Lysis-Java supports both SourceMod ( .smx ) and AMX Mod X ( .amxx ) files. It excels at reconstructing the control flow of a plugin into pseudo-code.