FileInfo.com - The File Extensions Resource

.LNG File Extension

File Type	Acrobat Language Plug-in
File Format	File
Common?	No
File Description	Adds support for additional languages in Adobe Acrobat
Program(s) that open lng files	Mac / Windows: Adobe Acrobat

Information from FileInfo.com - The File Extensions Resource.
http://www.fileinfo.com/extension/lng