[Xerte] Xerte - encoding xmls

[Tomasz Seliga]

Hi there.
I have a problem with creating the course's content in polish. The 
special polish letters eg: ą, ę, ó, ł etc, are coded in xml file 
incorrect, so whole course content doesn't work under LMS.
I found that xml files (and all else), are encoded in UTF-8 without Byte 
Order Mark. After resave xml as UTF-8 (Notepad++), content works 
correctly. Is it possible to fix that?
I use Xerte 2.18

Best regards.
Thomas Seliga