Read Germany text from file when NAV language is English

Hello all,

I need to import some Germany contact information from text file. The file is simple single byte csv file. By design, I need to read file programaticaly, I cannot use dataports. The code looks like below:

ImportFile.WRITEMODE(FALSE);
ImportFile.TEXTMODE(TRUE);
ImportFile.OPEN(FileName);
ImportFile.CREATEINSTREAM(InS);
BytesRead := InS.READTEXT(Buffer, MaxRead);

One of the street name in file is "Dweerblöcken", however when read this text into Buffer then actual value what Buffer holds is "Dweerbl÷cken", and this value goes to database. If I type Dweerblöcken into field directly using NAV then value stores correct. Why READTEXT converts specific Germany characters? What I'm doing wrong?

I use English (United States) NAV language, SQL Server 2008, Database Locale is set to Windows Collation "Afrikaans, Basque, Catalan, Dutch, English, Faeroese, German, Indonesian, Italian, Portuguese"

Any ideas?

Regards,
Arturas