Problem appears on Win98. libpng 1.2.5 compiled/linked
with MinGW 2.0.0. (GCC 3.2) using makefile.dj2 (zlib 1.1.4
compiled in the same environment). pngtest.exe works OK
with the default PNG file but it has problems when I
resize/save again with Irfan View/Paint Shop Pro (didn't
test other programs). It results in "invalid operation"
message box. I attach the PNG file causing problems, you
can try to reproduce. If needed I can also send the