How to open .XT files on Windows
To open .XT files on Windows, right-click the .xt file → Open with → choose a text editor (e.g., Notepad++, Visual Studio Code) to view the trace as text.
Step-by-step instructions
- Right-click the .xt file → Open with → choose a text editor (e.g., Notepad++, Visual Studio Code) to view the trace as text.
- If the file is extremely large, open it in an editor that can handle big files or use a command-line viewer (e.g., more) to avoid freezing.
Common issues
The .xt file is unreadable or looks like random characters
Not every .xt is an Xdebug trace; .xt is also reported for FastTracker 2 “Extended Track” files. If it is not plain text, you may be dealing with a different format.
- Try opening it in a text editor first; Xdebug traces should look like structured trace output, not binary noise.
- If it does not resemble a log, treat it as an audio/tracker-related file and check FastTracker 2-related tooling/support instead.
File is huge and the editor freezes
Function traces can become very large, especially if tracing is enabled broadly or for long-running requests.
- Open it with a large-file-capable editor or use command-line paging tools (less/more) to inspect it.
- Regenerate a smaller trace by limiting tracing to a single request or shortening the code path you trace.
Xdebug keeps appending “.xt” and you expected a different filename
Xdebug’s function trace feature commonly appends the “.xt” extension to trace files; this can surprise users who configured a fixed filename.
- Review Xdebug’s function trace documentation for the option that disables adding “.xt” so the configured name is used as-is.
- After changing settings, restart your PHP runtime (e.g., PHP-FPM/Apache) and reproduce the request to generate a new trace.
Security note
.xt Xdebug traces can contain sensitive information (filesystem paths, function arguments, and data passed through your application). Treat them like confidential logs before sharing.