PaintShop Pro Browser Cache
PaintShop Pro Browser Cache is a thumbnail image format associated with PaintShop Pro. The file is usually named "pspbrwse.jbf", and contains thumbnails of other image files in the same directory.
Files begin with a 15-byte signature: "
JASC BROWS FILE".
jbfinspect.c - Reverse-engineered file format specification included in source.