ID:163053
 
i have a lot of icons that i cant open on 3.5 . is there anyway to fix them back
Nope, its a one-time conversion and you cant convert it back. It's like how you can't install Windows 2000 with Windows XP as your current OS.
Yes; you can copy/paste the icons piece-by-piece and recreate the 3.5 icon from scratch.

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