always good to keep the last trail file to recover from a crash etc.
for me trail files are invaluable. esp if you want to batch process. right a batch file and then loop the trail file,
i used a trail file to load thousands of pro files into our PDM database....all done unmanned....
use a batch file to purge the startup directory....it can be started as an arguement or started manually whenever the user wants to purge the startup dir...
eg of a purge batch file below.
set path=c:\ptc\proewildfire2\bin;%path%
cd /d "%1"
start /B purge.bat
modify your 'path' to suit and it will work.