fix a QuickBooks company file that won't open, first try opening the file without loading previous windows by holding ALT while clicking "Open". You can also download QuickBooks Tool Hub and run it as an administrator, using the QuickBooks Tool Hub to run "Quick Fix my File," running the File Doctor tool, or turning off hosting on workstations. Also read:- https://a2cloudhostingservices.com/download-quickbooks-tool-hub/