I am going shopping for a tablet this weekend. I would like to take some files with me to test out the capabilities of the tablet. Do you have any suggestions? I want to take a movie but I don't know which format of file to use. I will take an mp3 file and earphone with me. I will also take a powerpoint file with me - can I download android powerpoint player onto a flash drive and take it with me or do I have to download it directly only the tablet? What other files should i take?