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What is .ufo3?

Name: Unified Font Object 3
Extension: .ufo3
Category: Font
Developer: Adobe
Description: UFO3 (Unified Font Object 3) is a file type used for storing font data. It is a cross-platform, open source format that is used to store vector glyphs, font metrics, kerning data, and other related information. UFO3 is the most recent version of the UFO format, and is the standard for font interchange between applications.
MIME Type: application/vnd.ms-opentype
Wikipedia: .ufo3 on Wikipedia