TraceOutputFileName

Adobe documentation

Sets the location of the log file. By default, the debugger version of Flash Player writes error messages to a file named flashlog.txt.

Set TraceOutputFileName to override the default name and location of the log file by specifying a new location and name in the following form:

TraceOutputFileName=<fully qualified path/filename>

On Mac OS X, you should use colons to separate directories in the TraceOutputFileName path rather than slashes.

Note: Beginning with the Flash Player 9 Update, Flash Player ignores the TraceOutputFileName property and stores the flashlog.txt file in a hard-coded location based on operating system. For more information, see the section on log file location listed below.