The transaction log file logs all changes to the company file before they are written to the file by the database manager.
It is stored in the same folder as the QuickBooks company file. The transaction log file is named [company file name].qbw.TLG.
Important: The .TLG file should be kept in the same folder as the QuickBooks company file (.QBW file) at all times. If the .QBW file is moved or copied somewhere, the .TLG file should be copied with it.
If QuickBooks loses connection to the company file abruptly for any reason, the .TLG will automatically correct the data file as much as possible. If part of a transaction was recorded to the company file but the whole transaction is present in the .TLG, the transaction will be completed the next time the file is opened in QuickBooks.