An , by contrast, is the compiled, executable version of the source code. It is generated by the MQL4 compiler and is the file that MT4 actually executes on the charts. It is essentially machine‑readable bytecode that cannot be edited directly. Once you have successfully compiled an MQ4 file, the resulting EX4 is what you distribute to other traders or attach to your own charts.
In the MetaEditor "Navigator" panel (usually on the left side), navigate to the folder where your file is saved: For automated strategies, look in Experts . For custom charts tools, look in Indicators . For one-time actions, look in Scripts . mq4 to ex4
Functions, variables, trading logic, and comments written by a programmer. An , by contrast, is the compiled, executable
An .mq4 file is a human-readable source code file written in the MQL4 programming language. Development, modification, and debugging. Once you have successfully compiled an MQ4 file,