[操作疑難] newbie questions on galaxy tab2

1. is this tab can play 'h.264 high profile' file? using the pps.tv app from google play but it always prompt that can't stream the moive due to missed 'h.264 high profile'. Other video player seem work well

2. at 'Widget' screen, it seem 'cached' app that used, how can i remove those cache?

Thank