.ETL File Extension

Log file created by Microsoft Tracelog, a program that creates logs using the events from the kernel in Microsoft operating systems; contains binary log data at the trace level, such as disk accesses or page faults; used to log high-frequency events while tracking the performance of an operating system.

Reports may be generated from ETL files using the command-line utility Tracerpt. ETL file output may be configured with several options, such as a maximum allowable file size, so that the logs do not cause a computer run out of disk space.