File extension	The full name of the file	Popularity
File extension $$$	Temporary File
File extension $DB	dBASE IV temporary file
File extension 001	Split Archive File
File extension 002	Compressed file from a multi-volume archive (part 2)
File extension 113	Iomega Backup File
File extension 73B	TI-73 Backup File
File extension AB	Google Android Debug Bridge backup file
File extension ABA	Palm Address Book Archive
File extension ABBU	Address Book Backup
File extension ABF	Analysis Services Backup File
File extension ABK	Automatic Backup File
File extension ACP	Alfresco Content Package
File extension ACR	Acer eRecovery Management Backup File
File extension ADI	Active@ Disk Image Backup File
File extension AEA	AdWords Editor Archive
File extension ARC	Norton Backup Archive
File extension AS4	askSam Backup File
File extension ASD	Word AutoSave File
File extension ASHBAK	Ashampoo Backup Archive
File extension ATE	Office Accounting Compressed Backup File
File extension ATI	Office Accounting Updated Company File
File extension BAC	Backup File
File extension BACKUP	Backup of current ISAPI application
File extension BACKUPDB	Apple Time Machine backup folder file
File extension BAK	Backup File
File extension BAK~	AbiWord Auto-Saved Document
File extension BBB	BlackBerry backup (post 2012) file
File extension BBZ	BerryBuzz Backup File
File extension BCK	VMX Backup File
File extension BCKP	Ad-Aware Quarantined File
File extension BCM	Microsoft Works Communications Script Backup
File extension BDB	Microsoft Works Database Backup File
File extension BFF	Backup File Format
File extension BIF	Get Backup Project File
File extension BIFX	Get Backup Project
File extension BK1	Autodesk Backup File
File extension BKC	Backup4all catalog file
File extension BKF	Windows Backup Utility File
File extension BKP	Backup File
File extension BKUP	Backup File
File extension BKZ	FileFort backup
File extension BLEND1	Blender Document Backup File
File extension BLEND2	Blender Document Backup 2 File
File extension BM3	Sony Ericsson Backup File
File extension BMK	BillMinder Backup File
File extension BPA	StorageSync Backup Archive
File extension BPB	PowerDesigner Business Process Backup File
File extension BPM	PowerDesigner Business Process Model
File extension BPN	ArchiCAD Project Backup File
File extension BPS	Works Document Backup
File extension BUP	DVD IFO Backup File
File extension CAA	CleanApp Archive
File extension CBK	Backup Configuration File
File extension CBS	Comodo Backup Script
File extension CBU	Comodo Backup File
File extension CMF	Connected Backup File
File extension CRDS	Windows CardSpace Backup File
File extension DA0	Windows Registry Backup File
File extension DASH	Dashlane Profile
File extension DBA	Palm Datebook Backup File
File extension DBK	OrCAD schematic capture backup file
File extension DIY	My Drivers Backup Setup File
File extension DNA	CA Backup and Migration Backup File
File extension DOV	Temp File
File extension DPB	DataPilot Backup File
File extension DSB	Dell DataSafe Backup File
File extension FBC	Family Tree Maker for DOS Backup File
File extension FBF	Free Backup Fix Backup File
File extension FBK	Microsoft Dynamics NAV Backup File
File extension FBU	FEBE Firefox Backup File
File extension FBW	HP Recovery Manager Backup File
File extension FH	Symantec Backup Exec File
File extension FHF	Free Hide Folder Backup File
File extension FLKA	Folder Lock Portable Locker File
File extension FLKB	Folder Lock Basic Locker File
File extension FPSX	Nokia Firmware Format File
File extension FUL	Microsoft Backup File List
File extension FZA	Form•Z Autosave File
File extension FZB	Casio FZ-1 Bank dump
File extension GB1	Game Maker Backup File
File extension GHO	Norton Ghost Backup File
File extension GHS	Norton Ghost Image Segment
File extension ICBU	iCal Backup File
File extension ICF	Zoom Router Configuration File
File extension INPROGRESS	Time Machine Backup Progress File
File extension IPD	BlackBerry Backup File
File extension IV2I	Norton Ghost Incremental Virtual Volume Image
File extension JBK	Juno Backup File
File extension JDC	JDownloader Links File
File extension KB2	Kleo Backup File
File extension LCB	Concept2 LogCard utility LogCard backup image
File extension LLX	LabVIEW VI Library Backup File
File extension MBF	Microsoft Money Backup File
File extension MBK	dBASE IV Multiple Index Backup File
File extension MBW	MBRWizard Archive
File extension MDBACKUP	iPhone Data Backup File
File extension MDDATA	iPhone Backup File
File extension MDINFO	iPhone Backup Information File
File extension MEM	FoxPro Variable File
File extension MIG	Windows Migration Backup File
File extension MPB	MyPhoneExplorer Backup File
File extension MV_	Movie Edit Pro Movie Backup File
File extension NB7	NovaBACKUP Output File
File extension NBA	Nero BackItUp Archive
File extension NBD	NovaBACKUP File
File extension NBF	Backup NOW! backup archive file
File extension NBI	Nero BackItUp Information File
File extension NBK	NovaBACKUP Job File
File extension NBS	NTI Backup Set
File extension NBU	Nokia Phone Backup File
File extension NCO	Nero BackItUp File
File extension NFB	Nokia Phone Backup File
File extension NFC	Nokia Phone Backup Copy File
File extension NPF	NTI Partition File
File extension NPS	NTI Partition Set
File extension NRS	Nero CD-ROM Boot EFI compilation file
File extension OEB	Outlook Express Backup Wizard File
File extension OLD	Backup File
File extension OMG	O&O DiskImage backup file
File extension ONEPKG	Microsoft OneNote Package File
File extension ORI	Original File
File extension ORIG	Original File
File extension OYX	Approach Alternate Database Index
File extension P21	PAR recovery volume
File extension PAQ	Hewlett-Packard Software Restore File
File extension PBA	PowerBackup Archive
File extension PBB	AT&T Phonebook File
File extension PBD	EaseUS Todo Backup File
File extension PBF	PowerBackup Data File
File extension PBJ	PowerBackup Job File
File extension PBX5SCRIPT	Personal Backup Script
File extension PBXSCRIPT	Personal Backup Script
File extension PDB	PowerDesigner Database Backup File
File extension PRV	Free Folder Hider Backup File
File extension PSA	Plesk Backup File
File extension PVC	Parallels Desktop Copied Configuration File
File extension QBB	QuickBooks Backup File
File extension QBK	QuickTax Backup File
File extension QBM	QuickBooks Portable Company File
File extension QBMB	QuickBooks Backup File
File extension QBMD	QuickBooks Backup File
File extension QBX	QuickBooks Accountant Transfer File
File extension QIC	Windows Backup File
File extension QSF	Qualtrics Survey File
File extension QUICKENBACKUP	Quicken Essentials for Mac Backup File
File extension QV~	ViewletBuilder Project Backup File
File extension RB4	Trend AntiVirus backup file
File extension RBC	Easy Resume Creator Pro resume file
File extension RBF	Windows Installer Rollback File
File extension RBK	Windows 95 Registry Backup File
File extension RBS	Windows Installer Rollback Script
File extension RDB	Retrospect Backup Set
File extension RGMB	RootsMagic Backup File
File extension RMBAK	Registry Mechanic Backup File
File extension RPK	NeverForget backup reminder file
File extension RRR	Registry Mechanic Backup File
File extension SAV	Parallels Desktop Saved State Image File
File extension SBB	Office Accounting Company Backup File
File extension SBS	Secure Backup System File
File extension SDC	Stardock Central Download Archive
File extension SIM	Steam Game Backup Information File
File extension SIS	Steam Game Backup Information File
File extension SKB	SketchUp Backup Document
File extension SN1	Drive Snapshot First Differential Backup
File extension SN2	Drive Snapshot Second Differential Backup
File extension SNS	Save-N-Sync Project File
File extension SPF	ShadowProtect Full Backup File
File extension SPG	TCP Optimizer Backup File
File extension SPI	ShadowProtect Incremental Backup File
File extension SPS	SyncBack Settings File
File extension SQB	SQL Backup SQL Server Backup File
File extension SRR	ReScene Metadata File
File extension STG	ActiveSync Backup File
File extension SV$	AutoCAD Automated Backup File
File extension SV2I	Symantec System Index File
File extension TBK	FoxPro Memo Backup
File extension TDB	eBay Turbo Lister Backup File
File extension TIG	TI Connect Backup File
File extension TLG	QuickBooks Transaction Log File
File extension TMP	Temporary File
File extension TMR	Free Countdown Timer Backup File
File extension TRN	SQL Server Transaction Log Backup File
File extension TTBK	Canadian TurboTax 2010 Backup File
File extension UCI	UFS Explorer Backup File
File extension V2I	Norton Ghost Virtual Volume Image
File extension VBF	VersaCheck backup file
File extension VBK	Veeam Backup File
File extension VBM	Veeam Backup Metadata File
File extension VBOX-PREV	Oracle VM VirtualBox Settings Backup File
File extension VPCBACKUP	Windows Virtual PC Backup File
File extension VRB	Veeam Incremental Backup File
File extension WBB	WinBackup Archive
File extension WBCAT	Windows Backup Catalog File
File extension WBK	Word Document Backup
File extension WIN	Windows Backup File
File extension WJF	WinZip Job File
File extension WPB	Windows Phone Device Manager backup file
File extension WSPAK	WebsitePanel Backup File
File extension XBK	XenServer Backup File
File extension XLK	Excel Backup File
File extension __A	File Splitter & Joiner Encrypted File
File extension __B	File Splitter & Joiner Encrypted Archive File
File extension ~CW	Circuit Wizard Backup File