Facing “Error 1904: [file path / name / extension] failed to register,”? The issue generally arises when the company file is damaged or dislocated suddenly. The best possible way to fix the issue is to run the QuickBooks Install Diagnostic tool. Make sure you close the software properly and then run the tool. Once the tool runs completely, restart your system. Hope this will probably resolve your issue. If not there are a few different ways to fix it. But for the contact, the QuickBooks support team and follow their step by step instructions to troubleshoot the issue and fix it without hampering other crucial files in your system.