How to make them human readable

By default, the files downloaded from FieldNet are in a .vri file, which is not human readable. These files are zipped, but running a simple command to unzip them will not work. The first byte of the file is not correct for a standard unzipping utility such as the unzip command on a unix system. The file header for a zip file is supposed to be PK\x03\x04, and the file header for the .vri file is RK\x03\x04. To fix this and allow your system to unzip the file, you have to change the first byte. To do this in your terminal (tested on macOS):

echo -ne P | dd conv=notrunc bs=1 count=1 of=filename.vri