WMV AVI MKV RM RMVB XVID video file types are not supported by Apple iPad natively. What to do? You can convert them to .m4v, .mp4, or .mov file format which supported by Apple. However, it is not the best solution if you have lot of unsupported video files. Try the simple way, get a 3rd party video player that can support multiple video formats. Personally, I tested OPlayer HD for iPad. And it is working on RMVB video file with frame skipping enabled. Not 100% smooth but better than cannot watch at all.
Yes, I love Android on HTC HD2. I cannot play DivX, Xvid, MKV, RMVB, FLV video on Windows Mobile 6.5. Even with CorePlayer or TCPMP video player help, I still cannot play Real Media and MKV video format. However, VPlayer for Android does play those video files for me. And most of all ~ it is FREE!!!
I have an old Pocket PC which is using Microsoft Windows Mobile 2003 Second Edition for Pocket PC – Professional. It uses 203 MHz Samsung S3C2410 processor. 25 MB user available memory is all that I have. Therefore, it is a little hard for me to play media files with this Pocket PC. However, The Core Pocket Media Player (TCPMP) saves the day. It does not require high end hardware resources to play media files like DivX video files.
TCPMP is an open source application but discontinued. It is known as BetaPlayer previously. The latest version is CorePlayer Mobile and Pro v1.3 from CoreCodec Universe. But you need to purchase it. Not longer a free product.