Files containing the .nib extension are most commonly associated with Interface Builder resource files. Interface Builder allows programmers to design and test application interfaces. The NIB files contain static representations of the objects used by the interface and how those objects are used by the associated application. The NIB files are referenced by the user's computer memory as needed.
The .nib file extension is also used for Corel Graphics10 Photopoint files, Disk image files and Adobe AIR files.
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If you have additional information about the NIB file format or software that uses files with the NIB suffix, please do get in touch - we would love hearing from you.