File Extension LAB File Format Label file (Visual dBase) LAB stands for Label file (Visual dBase). This was last updated in March 2012 By Margaret Rouse Browse File Extensions Alphabetically: A B C D E F G H I J K L M N O P Q R S T U V W X Y Z # Ask a Question. Find an Answer. Ask your peers a question about this file extension. Ask a Question How to use substring to separate words Visual Studio 2008 labs, training materials abundant How can I open and print contents of a Smart Label Printer "labels.sll. file?