How to install a file manager to Xperia L WITHOUT internet connection? It's a big shame that this phone does not have any file manager by default.

I have the .apk installer of the file manager on my PC, but how to install it on phone offline? (offline = no internet connection)

Help
Plug the device into the computer, drop the .apk into the sd card and use the web browser to go to file:///sdcard and open the .apk file to install it.