I just started using mobilism again after at least a year's absence and so far two out of three ebook files I've downloaded have an ".apk" extension after the expected ".rar" . What's the deal with these?
I believe you are clicking in all of the wrong places. For help on how to download from many of the file hosts used here, please see:
viewtopic.php?f=19&t=649944. The most likely culprit is that you are failing to uncheck a box that has a note about downloading with add-ons or some similar wording.