I guess this should happen with other languages having non ansi charset, because setting the language to ENG, solves the problem.

//Set to English, otherwise fname does not match the file in the filesystem, see gaPDFEmailFiles output in the log if we set language to LIT
SetLangMode(LangEnglish,"ENG",2);
PrintDocument(IVr,docname,false);

LogText(0,"gaPDFEmailFiles=" & gaPDFEmailFiles);
if (FormLinkDocumentFilenames(Mailr,gaPDFEmailFiles)) then begin
RecordCopy(oldIVr,IVr);

IVr.Prntdf = 1;
RecordUpdate(oldIVr,IVr,false);
end;
SetDocumentFilename("");
gPDFEmailf = false;


SetLangMode(LangLithuanian,"LIT",2); //Reset back to local language