Until Microsoft adds ISO support into your OS (rumors coming soon in the next windows release) use these tools. Handy way to get info into your virtual world. VHD ok but requires shutdown/startup in Hyper-V.
This tool has a nice option to create ISO from compliation. I have been using for years without fail.
FreeWare MagicDisc original free version. MagicISO is the pay version that does offer a free trial.