There is only one file type that uses the .NPF extension:
NTI Partition File
Backup file created by NTI Backup Now, NTI Backup NOW!, and NTI DriveBackup!; contains a backup of a full hard drive or a hard drive partition; can be used for creating backup discs; enables users to restore drive backups in the event of data loss.
NTI DriveBackup! is included with HP's Media Vault backup device. The product also includes NTI Image Explorer, which can be used for browsing and extracting individual files and folders.
NOTE: NewTech Infosystems no longer develops the older NTI Backup NOW! and NTI DriveBackup! programs. Instead they now develop NTI Backup Now ("Now" instead of "NOW!").
Updated: September 22, 2011