With Filestar you get 195 different skills for working productively with JPEG 2000 Image (.j2k) files.
About .J2k
Name
JPEG 2000 Image
Extension
.j2k
Format
Binary
Category
Raster Image
Developer
Joint Photographic Experts Group
Description
Compressed bitmap image that uses wavelet compression instead of the DCT compression used by standard .JPEG images; supports 16-bit color, alpha transparency, and lossless compression.