[poedit-users] Source code in Windows-1250 codepage. Nothing works!

Hello everybody!
I'm having serious problem translating from one Windows-1250 language, to
another Windows-1250 language. It seems that MSGID's cannot contain special
characters from such languages. Is it so? And why can't I choose
Windows-1250 as a source codepage? Not to mention that poEdit would not
update catalog file (from sources) if it detects Windows-1250 *anywhere* in
PO file. 
 
11:18:53: msgmerge: C:\DOCUME~1\robert\LOCALS~1\Temp\poe2745.tmp\input.po:
warning: Charset "windows-1250" is not a portable encoding name.
11:18:53:
Message conversion to user's charset might not work.
11:18:53: msgmerge: present charset "windows-1250" is not a portable
encoding name
11:18:53: Entries in the catalog are probably incorrect.
11:18:53: Updating the catalog failed. Click on 'More>>' for details.

??? 
I'm using poEdit 1.3.2, source code is written in Borland C++Builder 6, and
all the source is in CP-1250 codepage. 
Thnx!