Here, I made a picture-based tutorial for you. I'm on a Mac, but it works by the same principles. Step 1: Located modpack.jar in .technicpack/technicssp/bin and unarchive it (or open it in unarchiving software). Step 2: Drag all the files except Readme.txt and Worldedit.jar into modpack. Step 3: If you unarchived the .jar, select all the files, archive them, and rename the archive modpack.jar (or just rename the folder modpack.jar, but I prefer the former method). If you opened in in unarchiving software and added in the .class files without actually unarchiving modpack.jar, save it. Step 4: Put the Worldedit.jar file into the bin folder with the modified modpack.jar file. You're done!