difference between mq4 and ex4

hello

how can be edited an ex4 files like mq4 ones in metatrader editor 

Don't double post https://forum.mql4.com/56333#806871
paulselvan:

hello

how can be edited an ex4 files like mq4 ones in metatrader editor 

You cannot.
RaptorUK:
You cannot.


but if i want to read how the program is written or modify a part of program,how to do?
You read or modify the mql4.
The mq4 is for the human to read and edit, then metatrader compiles it into an e4 for the computer read.. it's not for humans.
paulselvan:

but if i want to read how the program is written or modify a part of program,how to do?
Contact the owner of the source code and ask for it . . .  if they say no then you can't modify.