There is only one file type that uses the .VF extension:
VEGAS Movie Studio Project File
Video editing project created with MAGIX VEGAS Movie Studio; saves the project timeline, effects, transitions, and references to the video and audio clips used by the project; can be exported to a DVD using Vegas Movie Studio+DVD or Vegas+DVD software.
VEGAS Movie Studio+DVD is geared towards consumers and is also available in a Platinum Edition, which supports HDV and 5.1 surround sound mixing. Vegas+DVD is geared towards video-editing professionals and includes advanced editing capabilities.
NOTE: Vegas software was previously developed by Sony before being acquired by MAGIX in 2016.
Updated: November 12, 2017