1)The windows OS is still there because during installation you chose the option to install linux on a separate partition and not disturb the current filesystem.
2)
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But if I use openSUSE, I can not edit the windows files.
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are you trying to modify the files on the windows partition itself? if yes then most probably suse is treating the windows partitions as read only because it is ntfs.
try copying the files to your linux native partitions and then try modifying them.
3)to play videos on linux you will need to down load the appropriate codecs..google for that...
hope this helps ... c ya!!