After installing the software run it being in online mode and let the app update over the air, when update is complete it will ask for registration, this time you need to close the app, and follow these steps:-
A. Copy the Customization.ini file. You find it in the Flash_tool_for_Xperia_X.zip.
B. Paste the Customization.ini file into the installation folder. The installation folder is the folder named Emma in the installation path.
for examples:-
a. Default path in Windows 64 bit is: “C:\Program Files (x86)\Sony Mobile\Emma\”
b. Default path in Windows 32 bit is: “C:\Program Files\Sony Mobile\Emma\
C. Come online and run the app by "Click Start > All programs > Sony Mobile > Emma (if you used the default installation path from step B above) to start the flash tool."
all set, run the app..
Regards,
Priyank Abhineet.