The only pmw to csv conversion we know of, would be export of data from old PlanMaker spreadsheets (.pmw) to CSV format, something that might very well be doable only with the original software.
But since PMW and CSV are common abbreviation, the pmw to csv string can perhaps also mean something else, for example the CSV-PWM technique, which is a modulation technique for flying capacitor multilevel inverter. Not related to file conversions at all.
Updated: August 14, 2023