Very interesting... The .3w files I created when I first received the printer easily decodes to a text file. I can open your .3w file and see the encoded text. But, when I run the decoder on your .3w file, it converts to text and I can see it just before the file auto deletes all the text - it completely deletes everything! I have to give credit to the folks at XYZ for their cleverness.
Update: I also tried decoding using a service on the net - not able to decode it - the following error is reported:
Sorry, it just wasn’t possible to decode that string. Please let us know if you think this is a bug in our code.
The particular error here was:
The input is not a valid Base-64 string as it contains a non-base 64 character, more than two padding characters, or an illegal character among the padding characters.
Mac OSX ElCapitan
Prusa i3 (two built from kits), 1 hacked DaVinci
Solidworks for models, Netfabb to repair, Repetier/Slic3r and Simplify3D