ICO/PNG files so it can display a graphical selection of thumbnails for the user to choose. I believe it is also reading the stored library of. It appears to have to trawl through each of the dock entries and parse the data before it can display the settings screen. One of the bugs is the time that RD takes to respond to an icon right click. Nevertheless it is still an enhancement for Win 10 &c as that o/s has a fairly awful GUI and start menu IMHO. Rocketdock still functions as it should on Win7/10 but as time went on a few minor bugs crept in that decreased its usability. It is no longer supported but it is still probably the best in its class. Rocketdock was written by Punk Labs (skunkie et al) and was originally written for XP but was never overhauled for NT6 usage. I use Rocketdock on all my Windows machines as I find the convenience of the MAC-style dock and the ability to customise is a real boon. Excuse if this is in the wrong place, it has some graphics elements so it may fit here.