I have a GMC-600+ that seems to work OK. I can download and view the historical data from the unit in the Data Viewer software. I cannot see the folder I created or the files that were downloaded into the folder I created. And yet, I can Load them from that folder into Data Viewer. When I Save As a .csv, it seems to save the file, but I cannot see it in the folder where I saved it. It is as if the GMC 600+ is saving invisible files. Sounds crazy, I know, but I really need that invisible .csv file. Any help is appreciated.