Understanding QuickBooks File Extensions

There are many extensions that QuickBooks uses and before you delete them, it is important that you know what they are and how QuickBooks uses them.

Extention Short Name Description
*.QBW QuickBooks Company file The QBW format is associated with Intuit QuickBooks software. It uses QBW files to store financial data, templates, letters, logos, and images for a company.
*.QBB QuickBooks Backup file format QBB files are backups of QBW files which store a company’s financial records, templates, logos, letters and images.
*.QBM QuickBooks Portable file Compressed version of the QuickBooks company file. *.QBM files are ideal for sharing because of the smaller file size.
*.QBI QuickBooks Image file The *.QBI file "holds" transactions that have been written until they are posted to the hard drive
*.QBR QuickBooks Report template When you export the template for a memorized report, QuickBooks saves the file with a .QBR extension.
*.DES Layout designer template export file QuickBooks provides a variety of templates that you can use for your forms
*.QBO QuickBooks Online Bank Statement File This type of file contains an electronic bank statement downloaded from a financial institution’s website.
*.INI Initialization File A config log file for QuickBooks.
*.LGB Little Green Box Related to SDK log files for QuickBooks  that contains encrypted information about user names and passwords. It is utilized when an application needs to communicate and connect with QuickBooks (like QuickBooks Point of Sale) while it is unattended or closed. The user name and password stored in this file is utilized to connect with the Sybase server.
*.QWC QuickBooks Web Connector This file contains encrypted information about 3rd party applications integrated with QuickBooks
*.QBP QuickBooks Print file This file stores form settings used by QuickBooks to print the form.
*.WPR.INI Windows Print file This file stores QuickBooks printer settings
*.AVI Audio Video Interleave A multimedia format that contains both audio and video data in a file. This is used in QuickBooks for "Show Me" files
*.IIF Intuit Interchange Format May be created for importing lists and/or transactions.
*.ND Network Data File A configuration file that allows access to the QuickBooks company file.
*.RTP   Used for auto-patch
*.TLG Transaction log file Keeps track of changes to the file since the last backup.
*.WAV Windows sound format Sound Advice files (used in CD versions of QuickBooks)
*.Qbwin.log QB Windows log File is created/updated when a user runs verify and/or rebuild. Logs problems found/situations corrected
*.QBBackup.tmp QB Back temp folders File created during failed online or scheduled backup with date and time stamp. Cannot be used to restore data.
*.Temp1234.qbt   File created during pass 1 of rebuild, and deleted automatically when rebuild is completed.
*.QBSDK.log   Logs for errors in QuickBooks and other services such as web connectors.
*.QWC.log QB Web Connector log Logs for Web Connector errors and process.
*.SyncManagerLogger.log  Sync Manager log Logs for Sync errors and activities.
*.ECML  Entitlement file Stores installation license, and registration data
*.1PA   Files used to create forms 940 and 941 (QuickBooks for Windows 4.0 through QuickBooks 2004)
*.TXT & *.SET   Used in QuickPay version 2.0/2.1
Prddesvr.exe, Product.fam, Perwin95.ini, Perrval.dll   These files are used for printing 940/941 forms.
Taxtbl.usa   Integrated Payroll tax table file


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