What is inside SSU file ?

[zzmakii]

Sorry for noob question.

My satellite receiver has software upgrade file in SSU format.
What is inside this file, and is it possible to extract components of the file ?

[Ghostenigma]

Here you have the explanation

[zzmakii]

Not wanting to offend you, but I can also use internet search engines myself (not only Google), and I dit it BEFORE asking this question.
And for your info, satellite receiver software upgrade file in SSU format is definitely not Systems Management Server (SMS) Hierarchy Manager Site Update ( Microsoft Corporation ) file.
The file is : 20130619_SE_ME_B4_1TUNER.zip

So, can you help ?