Text attachment corrupted by db replication on Android

[musumarra]

On Android platform once a db has been replicated I cannot access
attachments of type text/plain:

var doc = db.getDocument(docId).currentRevision;
var filename = doc.attachmentNames[0];
var file = doc.get(filename);

Ti.API.info("filename " + filename); // output -----> filename visita.txt
Ti.API.info(file.contentType); // output -----> text/plain
Ti.API.info(file.content.text); // output -----> all characaters are unreadable

On CouchDB server everything is fine and also on iOS replicated db, with
same method I could read the text inside the attachment.