Experiment unfortunately failed.
All two mobi files I can download without any problems. No pdf files at all.
"Invalid File Type
Web Browser cannot download this kind of file.
Only files with the extention .AZW, PRC, .MOBI or .TXT can be downloaded to your Kindle".
Duokan OS may be a "hack" for my Paperwhite, or I must wait for next Kindle upgrade in the future.
Amazon was created an upgrade with good pdf support for all Kindle Paperwhite GEN2 users, because another operating systems on another e-readers works fine with pdf, but not on Kindle in 2013 - so when people will hack Kindle to unlock pdf full support - they must write next update - or Kindle stop be the first known usefull e-reader in the world - another e-reader production with e-ink Paperwhite, browser without restriction, with mobi, ePub, pdf support - and Linux OS - and... Kindle will be thrown out of the window with this "Experimental Browser"...
Duokan for Kindle Paperwhite works with ePub and pdf files - so all restriction should be removed by Amazon. If not - new micro Android for Kindle Paperwhite will be good motivation to create it, and install in the future. We will wait
Thank you for preparing this test. If you have any others ideas... I can test.
Regards