A world file file is a plain ASCII text file consisting of six values separated by newlines. The format is:
pixel X size rotation about the Y axis (usually 0.0) rotation about the X axis (usually 0.0) negative pixel Y size X coordinate of upper left pixel center Y coordinate of upper left pixel center
For example:
60.0000000000 0.0000000000 0.0000000000 -60.0000000000 440750.0000000000 3751290.0000000000