There are no silly questions.
I copied this from CamBam website:
CamBam currently supports opening the following files:
# CamBam native file format (*.cb)
# Autodesk DXF files (*.dxf)
# 3DStudio files (*.3ds)
# GCode files (*.tap,*.nc)
Do a harddrive search for .tap and .nc files or search for new files and see what directories pop up.