How to extract binded file using batch script?

Question

I binded two files image1.png and image2.png using command copy /b image1.png+image2.png bindedimage.png. How can i extract bindedimage.png to image1.png and image2.png?

Answer 1

You can't do this reliably, since the information where file 1 ends and file 2 starts was not stored anywhere. They're just a single blob of bytes now.

However, if both files were PNGs, you can try to separate them by analyzing their structure: a PNG file always starts with the "signature" (bytes 8950 4e47 0d0a 1a0a) and always ends with an IEND chunk (0000 0000 4945 4e44 ae42 6082). Split the files at the place where the first IEND chunk follows the second signature. There is no program to do this, however.