Well, this is the story which happened. I downloaded the entire movie in many parts like part1, part2 and so on, totaled of 8 parts. Then, tried to extract all of them, and it does not work in this way. I think, there is a problem with some part of the file itself, the question is like if I can use the different program to extract that movie?! Or mention the way, I can still extract that movie regardless of any problems coming with those partially downloaded files.

i think if you want to extract all of them, you just need a one click.
you click only part 1, and it will automatically extract all of them.
if cannot extract, maybe the file is corrupted

I'd suggest using Win Ace, it's free. But if you can't extract any of them the file is probably corrupted. If you download WinAce you can open the file automatically, I'd try that.

Where I can download it?

Fine! I did download it!!!

It does not work in this way, can be extract! Any more suggestions?!

yes, you only need to click 1 file to extract it, usually the .rar file, or the .r01 file depending on how it's been packed. In my experience, even if one of the files are corrupt, winrar should still go through the motions of unpacking it giving you the appropriate error messages.
Of course, if you are talking about a file that you dloaded off a public bittorrent site, or limewire or such, there's always the possibility thats its a fake... either files full of 1's and zeros, or an empty file thats been given the attributes of a much larger 700MB or whatever size file.
Thats the risk you take if you want to use sites/programs like that. It could be worse, it couldve been a virus.
Other programs you could try are ALZip, 7-zip, or even boot into linux and try unrar, or ark.

Thanks. I will check them out, then post the reply either working or not!