There are a few potential explanations for why your QuickBooks Won’t Open. It may be because the application is not installed correctly, or there is a problem with the Windows operating system. The most typical explanation is that the file is broken or corrupted in some way. If you can open your QuickBooks file in Notepad, it’s not corrupt. Another typical explanation is that the file is stored in a read-only location, such as a CD or DVD. This is also a valid explanation.