Step 1: To begin with, confirm that the QuickBooks version you're using is the most recent one available. Step 2: Open the file with the identical version that was used previously. Any variation in versions creates uncertainty. Step 3: Rather than taking detours, open Step 3: Open the file directly through QuickBooks rather than going through an intermediary. Step 4: Make sure you are holding down the "ALT" key as you prepare to launch QuickBooks in order to prevent reports or other QuickBooks windows from launching. Step 5: Rather than immediately risking everything, try opening a sample company file first. Step 6: If at all possible, relocate the corporate file to a different location before attempting to open it. Occasionally, if you're lucky, it will open up right away! Step 7: You might also want to look at the company file's properties to see if there are any integration, compatibility, or file format concerns. Step 8: Try renaming the company file if it still isn't working. Although the chances are rather slim, it is still worth a shot. Step 9: Try opening the company file from the new place after you've moved it. Step 10.Rename the ".tlg" file in