Here is the list of best 5 software tools to get ICNS files back in Windows and macOS

Simple steps to recover deleted ICNS, macOS Icon Resource File on Windows & Mac

Step 1:
Download and install the program to the Mac or Windows platform
Step 2:
Kick off the program and choose the disk where you will perform the recovery
Step 3:
Clicking the Recover button will initiate the app’s powerful scanning algorithms
Step 4:
Click Recover again after selecting the files that you wish to restore from the preview display

Best 5 data recovery software for System Files

Disk Drill
Free version, Pro version $89

Free recovery: Free recovery - 500 MB

666762
R-STUDIO
R-Studio FAT $49.99, R-Studio NTFS $59.99, R-Studio $79.99, Network $179.99, Technician $899.99

Free recovery: No free version

57624
TestDisk
Open Source

Free recovery: Freeware

152488
iBoysoft
$69.95

Free recovery: Free scan

35675
MiniTool
Free, Personal $79, Commercial $199, Enterprise $399, Technician $499

Free recovery: Free recovery - 1MB

424233