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Invalid Font Resources
The invalid fonts dialog lists fonts that are considered invalid. Because Windows will not be able to use these fonts it is recommended to delete these invalid resources and get a valid copy from the vendor.
To delete individual items, select the items you want to remove and click "Delete File(s)". To delete all items at once click "Delete All Files".
Note: Invalid resources are not stored in the vault and these files cannot be recovered after you delete them.
Tip: If the font license permits it, you can also try to fix the font with a font editor. Most common issues are automatically fixed by just opening and exporting an invalid font in FontCreator.