Syntax:

TCLogfileViewer.exe [/All|0|1|{n}]

TotalCommander should be run, when you start TCLogfileViewer.
TCLogfileViewer uses SQLite for storing the logfile information.

Calling it without any parameter or calling it with parameter "1" will create the database in memory and only reads the most recent (the current) logfile. In this case the database is dropped, when you exits TCLogfileViewer.

Calling it with parameter "/All" or with parameter "0" will create (or update) the database "TCLogfileViewer.db" in the directory, where your TC logfiles are stored; all logfiles, which are found, will be added to the database.
