.NIL file extension

This is the basic program to work with .NIL extension

ArtIcons Pro

ArtIcons Pro Icon Library

ArtIcons Pro is an advanced icon maker for Windows operating system. It allows professional and amateur alike to create and edit icon images and manage icon files and libraries. Create and edit icons in either standard or custom sizes, in color depths up to 16 million colors, replace image colors, create and manage icon libraries for better and more efficient storage and more... (more)

The program works with the following extensions: ico, il, icl, nil, icns, rsrc and icpr

.NIL extension is also supported by the following program:

NovaPACS Viewer

NovaPACS Viewer NovaPACS Viewer Document