There is only one file type that uses the .LOF extension:
Audacity File List
File used by Audacity, a free audio editing and recording program; contains a list of files that are used for importing into an Audacity project; saves the filename, offset, and duration for each audio file to be imported; used for batch audio imports.
LOF files use a plain text format that is specified in the Audacity user documentation.
Updated: April 11, 2012