The .TLG File We get a lot of mail asking about the file named .QBW.TLG that is housed in the folder in which you save your company file. Many users don't know what it is, but they notice the file's size, and they write to ask what it does and why it takes up so much disk space. The TLG file can be extremely large (even larger than the company file), and it's one of the files that are backed up when you use the QuickBooks backup function to back up your company file. If you're backing up to a 2GB or 4 GB flash drive, there may not be room on that drive to hold your backup. However, the size of the TLG file is manageable; you can perform actions in QuickBooks to reduce the file size. We provide this article because the article about the TLG file on the QuickBooks Website Support pages has incorrect information. Click here to open the article, which is a PDF file.