.NIB File

The nib file extension is related to Apple Interface Builder. Interface Builder stores user interface resources in "nib" files.

The nib files are a statically stored representation of the set of interface objects used by the application and their relationships which can be efficiently brought into memory when needed, reducing development time and making it easier to localize an application for different markets.

A nib file extension is related to the Interface Builder developed by the Apple, Inc.

How to open:

Use Interface Builder to work with *.nib files.

How to convert:

Probably cannot be converted to anything else.