The following files are included in the zip file.
- Melodica System-Original.mq4
- P4L Clock.mq4
- Calc Timeshifts.ex4
- Melodica System-Original.ex4
The first file is the source code, that is, if you want to change anything the EA performs, you can modify it in this file and then compile it in MetaEditor. This will output an .ex4 file, which you can copy to experts folder and then add to the chart from the metatrader platform. Please note, it is the .ex4 file that is added to the charts (the EA actually) and this creates the pending orders. So, the fourth file is actually the EA - the .ex4 file, which needs to placed in the experts folder. But there is nothing wrong in placing the corresponding .mq4 source code file in the experts folder.
The second file - P4L Clock.mq4 is an indicator which needs to be added to the indicator folder inside experts folder and then added to the charts. This is used to show the current times of different time zones, including your broker time and the current local time on your computer.
The third file - Calc Timeshifts.ex4 is actually a script which is also placed in the indicator folder inside experts folder. This shows the different time offset the broker is. You can use it to know how much +/- GMT time difference the broker is from the GMT time. It also shows the same information for the local computer time.
The second and third files are used to help one determine values for the setting BrokerGMTHour of the EA.
Hope this helps.