Have you tried asking the nice Panny People in this forum? Once the files are in the computer Vegas will be able to read them.
http://forums.creativecow.net/panasonicagdvx100
Steve
Win7 Pro X64 on Dell T3400, MultiTB SATA, 8GB RAM, nVidia FX 570, Vegas 10e (and 11) x64 DVDA 5.2(build 133) Sony HDR-CX550V