How to translate english.php with other encoding?

I want to translate my main english.php with windows-1257 encoding but when I try to save the file dreamweaver opens a warning message: The document's current encoding can not correctly save all of the characters within the document. You may want to change to utf-8 or an encoding that supports the special characters in this document If I ignore and save anyway the changes work fine and appears correctly in the browser but if I edit again all changes turns into question marks and only new changes apllies. So I have only 1 chance to edit the file and any additional corrections will destroy previous work. So the question would be how to translate language files with other encoding?
By the way when I translate definitions I change page properties in dreamweaver
Tile/Encoding to be Baltic (Windows)
I also have changed charset in my english.php to be windows-1257 and all product descriptions are displayed correctly, so Zen Cart saves those characters correctly but I can't save them from Windows side.