So, you want to edit YATC's or Tibia's picture file? Here are some of our tools for that.
Command line These are available only through SVN and by manual compiling. - PicTool - GPLed command line tool to extract and replace individual images in PIC files
- SprTool - unfinished GPLed command line tool to extract and replace images in SPR files
GUI- wxPicTool - GPLed GUI for PicTool - download available below
Screenies | 
