why RAR files will be corrupted

I created a RAR file normally using WINRAR, but when I send to some one and
when they extract the rar it shows that the archvie is corrupt.
So what are possible reasons for a RAR to get corrupted.

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I've had this happen before. Usually with WinRar I have to do the compression over again and it resolves the issue. It can happen for any number if reasons during the process of compression, File read/write error during multiple processes, power outage during compression, etc.

Usually it's a one time occurrence because of something that went wrong during file compression.

Hope this helps.

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☠ MASQ ☠Commented:
Also check the version of WinRAR your recipient is using, RAR5 compression needs the newer RAR versions to decompress.  WinRAR 3.x for example can't handle the newer algorithms and even though a WinRAR product returns a "?Corrupt file" message.
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