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One of several possible causes of “cannot open a QuickBooks company file” is file corruption; other possible causes include network issues or the wrong file extension. This issue can cause access to crucial financial data to be blocked, which could interrupt business operations. Solutions include making sure QuickBooks is running on the correct version, confirming file integrity, and examining network connectivity. To fix the problem and restore file access, you might need to use the QuickBooks File Doctor program or contact a technical support provider in specific situations. Contact QuickBooks support at 1.855.856.0042 for assistance with persistent issues or to speak with a certified professional.