Photoshop Can't Open .png Files

Well, Chris, I couldn't check by myself because I had a very little time in these days, too much work to do, but every kind of file have its own header as you may know, regardless of the file extension itself, so I wonder why Photoshop can't read the file header instead of the file extension, considering that file header is almost every 8byte long, so reading the first 8 bytes identify for sure the file type and then it can be handled by the specific function to view it. That's how programs usually work, extension are useful to the user to identify a file, but shouldn't be the only way a software identify a file type. Micosoft itself, that is known to be bad to user-friendly stuff, can open document with MSOffice even if they have not an extension. Mac open everything regardless of extension, Linux open everything regardless of extension.

Now, in this specific case I really don't know if the png have the right header, as I said I will check it as soon as I have time, but the above suggestion should be taken in consideration. Reading the first 8bytes of a file will not cause any performance issue, just two codes line to add (and an associative array with header->filetype to be passed to the PS CS5 function that open the files...).