extension differences between ex4 and mq4 files ?

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Hello, i would like to know the differences between ex4 and mq4 file, like i download a ex4 file is there risks like i i want to use it in the future there is an expiry date or one day the owner of the code, delete it ? Thank you
 

Mt4 : Softare to execute the ex4 File

mq4 : mql4 language codes

ex4 : Compiled file 

If you buy a MT4 product , you will get an ex4 file, You can't modify it, you can only execute it using MT4

Productivity - USA - MetaTrader 5
Productivity - USA - MetaTrader 5
  • www.metatrader5.com
The productivity index measures the output produced for each hour of labor worked. This indicator is useful for predicting inflation and output growth. If the cost of labor increases respective to the increase of productivity, and, moreover, if the increase in production costs is unlikely, then it will not cause inflation. It has a significant...
 
In fact i found an ex4 expert advisor for free, but i can't see the source code behind, so i am wondering, will it be functional in one month, one year ?
 
juju06:
so i am wondering, will it be functional in one month, one year ?

There is only one way to know :)

 
Andrey Barinov :

Il n'y a qu'un seul moyen de savoir :)

you mean like, wait for the unxpected moment the ea will bug ?
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