Gleb,
Compatibility really depends on the type of file you are sharing. Personally, with text documents I share both a copy of the Word document and a PDF copy so the text is "locked in", having issues with reformatting margins, etc. in the past when opened on various devices. For sharing audio files, I stick with .wav files and video, Quicktime MPEG 4-h.264. In my experience, the video standard changes every few years- this latest standard has been far more successful across platforms than many older codecs. Ensuring the latest plug-ins/drivers have been installed on the device is also crucial.… >>>