Question:  What does Potter do? Answer:  Potter searches for non-power-of-two-textures on your computer. Question:  What does power-of-two mean? Answer:  Here is a generic explanation. Question:  Why is it important to use power-of-two-textures for game development? Answer:  The reason that most systems demand power-of-two-textures is mipmapping. Question:  Which file formats are supported? Answer:  DDS, JPG, PNG and TGA. Question:  What do I need to run POTter? Answer:  You need the Java Runtime Environment to use it. Question:  Why do I get a security warning when running POTter? Answer:  POTter is a Java applet and runs in a sandbox environment. It needs to get out of that sandbox and have (read only) access to the file system to check image files.