ok ricks and kels, it does not work on vista, but i made it work, its so simple, i thought i share it with you guys, so in future you might use this method to install "cab" addons. this is what i did to make it work. example to install kels uberpack 1: create a folder and name it, say uberpack 2: extract all the folders and files from the addon to uberpack folder you just created EXCEPT the "CAB" 3: create another folder inside uberpack folder and name it "i386" 4: extract all the files and folder to "i386" the one you just created, from the "cab" inside the "cab" addon 5: now create a another file inside the uberpack folder and save with bat extension "install.bat: 6: edit the "bat" and add the command: rundll32 advpack.dll,LaunchINFSection "your info file name.inf",,1 exit 7: thats it done, now just run the install.bat file and it will install it without prompting you to locate "i386" folder. you can also delete the cab folder as it will not be needed with this method. you can also compress all the files and folders inside the uberpack with winrar and add on the comment section: Setup=INSTALL.bat TempMode Silent=1 Overwrite=1 this will make it more cleaner and easy to use with wpi. i hope this was helpful to you guys who might want to install cab addons with wpi or on vista. NOTE: ONLY WORKS WITH THE ADDONS THAT HAS "inf" FILES