With v9.1 you should have access to PADs libraries\common; they have a decal and part type using the same name "DIP40-600". I seldom use the canned library parts and you will need to verify the lead/row pitch (0.1"/0.6" I assume correct) and the hole/pad size. The hole size is probably 0.035" and maybe too small for your socket, I recommend minimum 0.04" finished hole size. Also, these canned libraries do not code padstacks info for soldermask etc. - your call to add or allow cam directory to apply automatically. They do code a layer 25 which we used to use for negative planes, which we don't anymore. Without knowing the mfg. for your socket, I could not quickly find a datasheet. Solder tail is the PCB stick thru portion of the lead and is tinned for solder-ability.