Well…try this steps:
- Open the “Start” menu and click “Computer” or “My Computer” depending on your version of Windows. Navigate to the C drive.
- Open the “Notes” folder. Double-click on the “Notes.ini” file to open it in Notepad.
- Place a semicolon (;) in front of the following two lines to temporarily disable VirusScan:
AddInsMenus=NCMenu
EXTMGR_ADDINS=NCExtMgr - Click the “Save” option from the “File” menu. Close Notes.ini.
Or visit: https://social.technet.microsoft.com/Forums/appvirtualization/en-US/612aacd1-c4ba-47eb-bf9c-0940d2ea1a05/lotus-notes-backup-data-nsf-file-corrupted?forum=itproxpsp
U can find info for solution this problem
solved Recover damaged lotus [closed]