e:cue Lighting Application Suite's Programmer outputs DMX via e*net, a proprietary network protocol that is only understood by e:cue Butler dongles.
A large (but a bit outdated) library is included. Some fixtures are available from their support forum. New fixtures can be created and imported in the Library Editor application.
Open the Library Editor application. Then either right-click User Library in the left panel and select Merge Import…, or select Library > Extern > Load/Convert… in the menu and select the downloaded file.
Fixture files in subdirectories are not recognized.
C:\Documents and Settings\[user name]\AppData\Local\ecue\Library V7.0\UserLibrary.xml