These are JPEG Zoom background files in a Zip folder, labeled as follows:
W for white
B for blue
DB for dark blue
G for green
DG for dark green
Also included is an extra alternate design of the colored background versions with a lightly shaded, enlarged logo on the right side in case you would like the backgrounds to match the original white version. The new alternate designs have the same color letter in the file name but with the number “2” at the end (B2; DB2; G2; DG2).