Decrypting .SMK Files from 2014 (v5.1) SDK Emulator?

[mcbane]

Hi,

Does anyone know how to decrypt the smk-files from emulator named above?
I tried this:

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openssl aes-128-cbc -d -K 2B421CC9A46A67A685873205212007838534CEF9B055FC016824FC01177E4C79 -in Widget.js.smk -nosalt -iv 1DA76DE2A0EE55C0DBCCEDA772E3684D -out Widget.js

This nearly seems to work. I can read most of the file, but on beginning I have some cryptic symbols:

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???ox?????|?
?	null){this.Common=new Object()}if(this.Common.API==null)
[...]