Rich Wood here.
I tend to overdo things so have E-readers from Kindle, Kobo and Sony including virtually all Kindle models from Model 1 to the new Model 9 7" Kindle Oasis on order. The Kobos include the 5" Mini and the two 7" versions, Aura and Aura H2O. The Kindles include multiple copies of the DX. Love the large format for home reading. The Sonys were bought very used and include a 300 and a 505. I am looking for any method for doing side loading of files as I have not found instructions for doing so and my main computer is a antique PC running Win XP and the Sony reader control program no longer seems to be available for my antiques.