I have many excel files in my computer, and the icon of all of them are plain paper, like this:
I want all icons to be .numbers icon. Do anyone know how to do that ?
Here's what you could do :
Or you can change the default app for a file type and set all files of that type to be associated with the default app if that's what your question says:
This will make all your excel files to open with numbers while the previous one will just change the icon
Here is a simple solution that works all times:
Find the file with icon that you want to apply for (ex: *.numbers file), then Command + i to open it's info Panel
Find the file you want to apply the icon for (ex: your *.xlsx) file. then Command + i to open it's info Panel
Now that you have your two file's info panel side by side, you can drag the icon from the first file's panel ( only from header/title bar ) and apply it to a second file's panel, as shown: (you must place the icon over the second icon to make it work, I didn't make it overlap just for taking a clear screenshot)
Open a champagne and celebrate!
To change the file icon on all you files icons with the same extension:
You have to empty your cache for icons after you have changed the icon or switched the file association program. Not sure the exact filename, but use it to empty both cache folders. ~/Library/Caches
and /Users/User/Library/Caches
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