PDF has it’s own module in 1.8 series, therefore it is supported.
PowerPoint is similar, there is PP module, but it also requires to be enabled in the Window display profile in Xibo and of course PP needs to be installed on the PC with the Xibo player - https://xibo.org.uk/manual/en/media_module_powerpoint.html
Webpages and flash, basically if it works in IE then it should work in Xibo as well, due to a bug in 1.8.2 player, please make sure that browser emulation is correctly set Enabling HTML5 in the Windows .net Player