This has already been suggested to you by Corion, but since you don't seem to have noticed, try to open the file with a text editor (preferably a hex capable editor). If you see HTML or CSV content (or XML, JSON, etc.), then you know you simply have to use another parsing module. That's really the first step, because you need to know what type of file you're really working with. If it looks like binary content, then you need to further investigate.