Open ETL File
An ETL file is an Event Tracking Log file, which is why it stands for.
This ETL file keeps track of events on your computer, such as page faults.
Event Trace Log for Windows is a powerful kernel-level tracing facility that allows you to log kernel- or application-defined events to a log file.
You can consume the events in real time or from an ETL log file and use them to debug an application or to determine where performance issues are occurring in the application.
If you want to read the ETL file for information about processes on your computer, such as various errors and disk usage, you can do so using the 'Event Viewer' program.
This program is built into the Windows operating system, so you don't need to download any additional software to read an ETL file.