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I also was able to achieve open files using "Open RAW files" from Audacity, using this settings : I can open using audacity, from standard open files. The audacity is on default settings, with sample rate 44100Hz. Probably hard disk half overwritten with browser cache? I don't know. Some of them did have header and still open-able with audacity itself (example : this one), and some other are just complete nonsense, sometimes having the header filled with text from random javascript or HTML code (like this one).
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So I left with bunch of *.au files, after using recovery program. My team accidentally on purpose clicked NO when Audacity asked to save the recording.
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