QuickBooks Company File Repair. A QuickBooks Company File (QBW) can become corrupt due to several reasons like large file size, improper system shutdown, virus attack, etc. other possible causes of the QuickBooks company file corruption, how you can know about it (symptoms), how to prevent this from happening. Also, it describes how corruption in QBW file can be fixed through free as well as professional QuickBooks File Repair tools. If you’ve been waiting for a concise guide about repairing QuickBooks file, well, this is your lucky day!