This is the "compiled" version. It is what the MT4 platform actually runs. It is machine-readable but looks like gibberish to humans.
MetaTrader is designed never to reverse compilation. The platform respects intellectual property.
Any website claiming this is lying. Decompilation requires heavy local computing; it cannot be done reliably in a browser for free.
An is a compiled, machine-readable version of the MQ4 source code . When you compile a file, the human-readable logic, comments, and variable names are stripped away or optimized for the MT4 terminal.