how to find out passwords of files ,,must read

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i know how frustating it is when u download a large file from the internet and find out that it is locked with a password that u dont have..cracking a password with advanced password recovery is a question bcoz it takes 3 days to find a pass word of 8 charectors and no one can sppend that much time.. so share ur xperience and tell a better way of cracking passwords...