How to Make A Portable Application For FREE Portable apps are very useful when working on computers that you don’t want to install software on. They are very useful in a WinPE or Live CD when the computer does not want to boot. You can do just about anything from a Windows preinstalled environment. Remove Malware, fix common Windows issues, Fix MBR, Data Recovery and Backup Data. These are just a threw things you can do with a WinPE.