Text Encoding Mexico C/AL NAV 2016

Ehernandez

Hi, again jeje, I need help , I have the next scenario.
I have to make a Electronic invoice for Mexico, but the Invoice need have a special characters, example Biciclá-ta , Silla inv. PARÍS, negra,I save my text in a blob file, then i read this blob and storage her content in a bigtext, and finaly I read char by char to save the string in my txt with all the string.
My code
VATFILE.CREATEOUTSTREAM(ostre2);
SalesInvHeader.CALCFIELDS(SalesInvHeader."Original String");
SalesInvHeader."Original String".CREATEINSTREAM(Instr);
VarBig.READ(Instr);
FOR I:=1 TO VarBig.LENGTH DO
BEGIN
VarBig.GETSUBTEXT(VarText,I,1);
//NewText:= Ascii2Ansi.Ascii2Ansi (VarText);
ostre2.WRITETEXT(VarText);
END;
VATFILE.CLOSE;
Download.DownloadToFile(TempFile+'\cfdi.txt',LocationCadena + '\cfdi.txt');

as will you see, i can try use Ascii2Ansi function but dont work correctly, also I try use TEXTENCODING but don't work too.
My txt have this:
Biciclÿ-ta
m›vil
PAR„S

Note
I make a simple Electronic invoice with 2 productos and i dont have problem, but later i try make the same invoice but now with 16 productos and don't work

AND again sorry for my terrible terrible englihs, i hope understand my problem