There is only one file type that uses the .LABEL extension:
DYMO Label File
A LABEL file is a file used by DYMO printers, which specialize in printing labels. It contains information about the design and layout of a label for printing purposes. LABEL files include paper orientation, paper name, drawing coordinates, text object placement, font size, and object information.
DYMO labels are commonly used for business purposes such as printing envelopes, file labels, and badges. The printers come with software, which includes DYMO Label, for entering data and customizing labels for your own purposes.
Updated: September 14, 2016