Due to "Mir3Game.exe" being packed in the last year or so? they probably changed it to-be annoying. It might mean the same string but just an encrypted version.
Key change:
"res070821mir" -> "Y8vkFwSacHjCFThh"
If previously released "item.dat" programs have hard-coded there key; they will need updating at the source level. Based on the unpacked executable; this only applies to "item.dat" from what i can see, the old key still works with other ".dat" files.
Latest header:
<!--MINI3 XML Data v2.01-->
<!--Language version : KOR-->
<!--Export to file by : 김지환-->
<!--Created at : 2022-01-25 15:57:29-->
This has only been tested on mir3 "Data/item.dat" i don't know if the mir2 key has been updated and if the same key was used.
Download item.xml:
https://ufile.io/hp1kqcnc