LAS\FILE Mode Name [SINGLE|MULTIPLE] [/CONVERT] [/OVERWRITE] Selects the input and output files. FILE IN Name open an existing file as input FILE OUT Name open an existing file as output FILE OUT Name Type creates a new output file of the specified type FILE BOTH Name select the same file for input and output. FILE UPDATE Name open a file for Updates only. See subtopics for details. The default extension is .30m but can can be specified using command SET EXTENSION.