Installed or portable doesn't matter in this case when the CPU architecture itself is not supported. PortableApps programs are still x86 or x86-64 executables and will not work on a system with an ARM CPU unless they are recompiled.
Moreover, even if they are recompiled Microsoft has restricted Windows RT only to Store apps. The only way you can run third-party desktop apps compiled specifically for ARM CPUs on Windows RT is by jailbreaking the OS, which is only possible with Windows RT 8.0 so far and not 8.1.