Drupal: png is not allowed extension (but it is!)

Question

hi,

I'm running Drupal on IIS server 6.

I'm having an interesting error to upload images into my node. I get "png" is not a known file.

See image: http://dl.dropbox.com/u/72686/pngError.png

But I've added png (default settings) to the allow image files list, and indeed you can see in the same image, that png is an allowed extension.

Thanks

Answer 1

This sounds like a known bug in Drupal core on IIS. Your specific error message is found here, which points to the Drupal core bug here. The bug is still open, but it sounds like there's a working solution and I just uploaded a patch there to make the fix a little easier to apply.