i got a problem with BF1. when i put a map in my addon folder the game says something like 'buffer overun detected! deleting program'.
can anyone help me?

BF can CTD on patch 1.1, but it never deletes the file.

You have to download patch 1.2 that should fix things.

get the 1.1, 1.2, or 1.3 patch
They are able to handle more maps
I recommend that you get the..
1.2 patch if you like to play online sometimes
1.3- if you don't play online and enjoy using a free camera to take screen shots

You don't actually need the 1.3 to get the free cam. There's a download for it but it's in 7z.

Or, you can use BattleBelk's Interface Tool, when munged it also gives a freecam.