ok, emule files are split and downloaded into parts. (This is because to avoid corrupted files, parts that are corrupted can be downloaded again without downloading the entire thing).
Most video files have important info in the last and first parts of these files, so you need to download these before they can be previewed. There is a option in the context menu (right click) which lets you choose to download the first and last, but it wont always do this straightaway.
When you have these chunks, you may also need to have additional MBs to of the video to preview properly.
11MB is just to small a data to preview. As a chunk is rougly 9MB, you've only got one full chunk.
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