Xml file translator

On my previous phone (galaxy sky android 6) I saved some sms messages mainly for the pictures it contained but also because there was some information given to me thru this thread that I didn't want to lose. So I saved it and just emailed it to myself. It was converted to an .Xml file and when I open it I cant read all the messages seems some like random sentences are missing and theres absolutly no pictures. And every few lines it just has a <locked> and I dnt figure this out. Ive tried online conversation sites xml viewers. I put them on my laptop and tried different things and no matter what I do the file stays pretty much the same and I cnt get the pictures.