Share your experience!
You have to use File Commander,it will work.
http://www.androidcentral.com/kitkat-sdcard-changes
Kitkat,you should read.3rd party apps do not have permission to write the SD.
Internal storage should not be read only,SD card should be.And yes,all kit kat users should have this because of google.
Someone wanted this before,I am not sure you can but you can try Astro.Also File Commander paid version can do that.