I was beginning to learn bt. File like tv-rmvb can be seen by my realplayer. But,file format like rar
can not  be played by my reallplayer.  During processing the rar file by my realplayer, it states that
it needs to update new component to play the file.Later,it says that it has no permission to
update.(maybe, my realplayer is a trial version). Please suggest how can view those rar format
files.

Thank you

rar is a compress file format, you need to un-compress. you can try winrar www.rarlab.com

RAR唔係影像檔 , 樓主試試用壓縮軟件將個檔解壓再試試.