.DGNLIB File

The dgnlib file extension is associated with the MicroStation, a CAD modeling software that allows architects to modeling engineering, construction, and operation of all infrastructure types.

The dgnlb file stores text styles, levels, dimension styles, multi-line styles etc.

How to open:

Use MicroStation to open *.dgnlib design library files.

How to convert:

Probably cannot be converted to anything else.