NTFS - which we believe is still a 32bit system. Yes, VideoWave5 is able to capture >12GB video files and it's able to convert it to mpeg. It does so in batches (seperate files)... we discovered unfinished 1.2GB file. However, the problem lies in the conversion process where it may falter somewhere along the line. Sometimes it may run for 30min or 2mins before it crashes. This was done with minimal processes running... no firewall, AV, etc. We tried several AVI file splitters but none could read the 12GB file. So we redid the scene to 7GB (33Mins). It crashed in the conversion process at 92% complete! Perhaps it was just too much for the software to handle. But windows didn't state it was a software problem... it said it might be a hardware or driver problem (blue screen of death).