winmount is a windows program that allows the creation of ramdrives from various formats...examples zip, rar, iso's. I haven't installed the carrara 6.1 update but I do use carrara 6.0.x pro. With carrara I use winmount to access runtimes in zip or rar files that aren't part of my normal runtimes which are always connected to carrara via the browser/content tab. at first I tried using an iso creation program and organizing my runtime folders that way. but since many programs open zip files I choose that format to replace the iso's. I may start using 7Z from now on for its higher compression rate.