TraceLocation > Filename

The FileName setting (Map Settings > TraceLocation > FileName) specifies how a map trace file is named. A map trace file with a default name is overwritten the next time the map is traced. Specify a custom name or a unique name to compare map trace files across multiple runs of the same map.

Default
The default map trace file name is mapname.mtr.
Custom
Specify a name for the map trace file in the Custom > Value field.
Unique
Automatically creates a unique map trace file name in the format:
Mer_mapname_processKey_mapCounter_hostname.mtr