Can you convert binary to text?
Can I trust this XML to TXT converter with my files?
Can I use this XML to TXT converter on any device?
The file is not just "binary data" of the xml. There is a "format" to the android xml.
You can look at AXMLPrinter2 - it takes the binary xml and converts it to human readable. I Linked directly to a class that looks like it does the bulk of the work.
What information do you need from the manifest file? The aapt.exe in the android SDK can also pull all the info out of the android manifest file. You would just have to run that command (with the needed switches) and parse the console output stream.
The file looks like it is encoded in a custom format, I don't think there is a .NET library available for decoding it, so you'll have to rewrite a perl script like axml2xml.pl to do it for you. Unfortunately there isn't a quick-and-easy solution, but looking at it, rewriting it shouldn't be too hard.