World File Extensions

[Paul Selormey]

Hello All,
What are the world file extensions supported for non-GIS raster
formats like the PNG, GIF, JPEG/JFIF etc?

>From the information I got so far, it ERSI is using the following

Windows Bitmap (*.bmp) --> *.bmpw or *.bpw

TIFF (*.tiff, *.tif, *.tff) --> *.tfw

Sun Raster File (*.sun, *.ras) --> *.snw, *.rsw

However, I could not get information on the PNG, GIF and JPEG.
Which source file contains these information?

Best regards,
Paul.