Lotus Notes file (*.nsf ) is truncated !!!

Dear all advance ,
I have try to import a lotus notes mail file (*.nsf) .
When I try to open it , it state that the file is truncated . Do anyone knows what to do to reattach the file to lotus notes . By the way , Would someone knows does the file is corrupted ? If it is , please suggest what kind of software can repair it ?
Thanks all advance 's opinion !!

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