Transferring files between PC and Android Sony Z1 Compact (KitKat) without needing app (i.e. via standard USB mass storage) When I plug my Sony Z1 Compact Android phone into my Mac or PC, the phone prompts me to install a program on the PC/Mac.

Can I not just have the phone behave as a standard, common USB Mass Storage class (i.e. like a USB pen drive, hard drive, or SD card), without having to install a program on the host PC? 

This is an inconvenience as if wanting to transfer to a PC that's not my own, I may not be in the position to install such a program.

Update
This was so easy on Android 2.3 on a HTC Desire Z - plug it into a Mac, PC or Linux desktop (i.e. the host), phone asks which mode it should be in, select the USB storage / harddrive option and then the phone appears as an ordinary external disk on the host machine.
The program that your phone ask to install is PC COMPANION. You can skip the PC Companion installation. 

If you need to connect in MSC mode 

In Settings-> Xperia Connectivity->USB connectivity->USB Connection Mode-> MSC