QB Issue Resolution:

Using Windows Explorer search your computer for QBW files.  When you find it, make a note of its location, then open QB and use File > Open or Restore Company File and type the location in the top address bar.

Resolution for Issue 'Need to find hidden QB company' available: Yes (Solved).
Source: Intuit Community forum.

Need to find hidden QB company: 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 address bar
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