Binary files must be of type 'WBIN'. Binary files can be created with Fortran, C, or other programs. 4-byte real values Binary files are much smaller than text, and read and write much faster.
Raw images are binary images.
You will then be presented with a standard file dialog from which you can select the file to read. The data from this file will be displayed in the current window. Then, select the Perform DWT item from the Wavelets menu. A 2d DWT of a 256x256 image takes about 20-sec on my Centris 650. The discrete wavelet transform is a multi-step process.