Share your experience!
i downloaded winrar app but it could not extract the files as third party apps are not allowed write access to memory card or internal memory. same with the other archeiving apps.
so from now on, for xperia e3, forget to operate with rar files or any compressed files.
the end. 
Not true,you should be able to be able to modify apps on internal,I have Z1 on 4.4.4 and I have winrar and I am able to extract in internal.
Not true works fine for me - You may not be able to extract to SD card but internal you can as I use it myself