@slowsmile...Thank you for your help.
I've set the character set that zasugerowałeś that is Unicode UTF-8 and tried out different sets of characters related to Central Europe. All display Polish letters inappropriately.
Only Polish letters began to correctly display when I chose the LibreOffice character set Western European (Windows-1252/WinLatin 1). A little strange but most importantly, it works.
Once again, sorry for my poor English.
Regards bravosx
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