Is it possible to virtually merge two directories? Fx. Merge a folder with videos and a folder with subtitles, so the video-player will find subs, but they won't be visible when browsing videos. How to virtualize some registry-data when launching a program? Some programs on portable drive use registry and system drive folders, so in order to use those specific folders have to be redirected, and the registry data have to be added. Can the added registry-data be virtualized so when quitting the program, they are gone again?