Adobe Acrobat Language Plugin File
Adobe Acrobat is a application from Adobe Systems that is used to create and open .pdf files, as with most Adobe applications the program can be improved by the use of plug ins which add functions.
Plug ins that have the .lng extension are language files and as such are used to add additional languages to the application.
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How to open .lng files?
Software to open .lng files
What are .lng files