Help, how to make Finder to refresh custom icon programmatically

Hi
I have two file both are same name, e.g. 1.rtf, but with different custom icon.
When I copied the first 1.rtf to an USB drive, the custom icon was displayed correctly.
However, when copied the second file to the USB drive to replace the first file, Finder still showed the custom icon of the first file.
How can I solve this issue and how can I make Finder to refresh the custom icon programmatically.
Thanks

Hi KT, thanks your reply & help
but result is same. The following is my experiment
STEP 1: copy 1.rtf to USB drive, the result is OK.
STEP 2: copy another 1.rtf to USB drive, Finder still showing the 1st file icon and a little bit blurred
STEP 3: copy 3rd file without custom icon, the result is OK
STEP 4: using following code to set its custom icon, the result is still show the custom icon of the 1st file
[[NSWorkspace sharedWorkspace] setIcon:image forFile:[filePath stringValue] options:nil];
It seems that Finder will has some cache to store file's custom icon. If use "Force Quit" to relaunch Finder, it become correct but how can I use program code to refresh it without "Force Quit"?

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Help, how to make Finder to refresh custom icon programmatically

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