QB Issue Resolution:

Are you running the latest version of QuickBooks 2014 (R6)? You can download it from here:

http://support.quickbooks.intuit.com/support/

You might be running an earlier version and already updated your file.

Resolution for Issue 'When I try to open my company file (which has been used successfully), QB says it cannot open the file.' available: Yes (Solved).
Source: Intuit Community forum.

When I try to open my company file (which has been used successfully), QB says it cannot open the file.: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

Support for Company File
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Error Recovery for Company File [Canada]
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Additional Support Options: