mishmat

Hi everyone I purchased a cnm h264 setup last summer, now the police want to look through some of the recorded files to veiw an incident that happened down the road from me. The police have given me a usb to put them on which i have done. the problem now is that i cant view the files that are on the usb!!! Is there any software that i can download to convert it so i/police can view it? Thanx