Capture One V4 naming conventions

[billy]

when I start a new tethered session in V4 it names each capture with the session name, then a space, then the capture number. for example; visa 233.tif

isnt there a golden rule to never leave a space in a file name? aren't you supposed to use an underscore, ie: visa_233.tif

been looking thru all the preferences and cant seem to change this naming convention.