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For what it may be worth, I checked the dagger.png file using PNGCheck 4.01 and it seemed happy.
D:\tester\>pngcheck -v dagger.png
File: dagger.png (1930112 bytes)
chunk IHDR at offset 0x0000c, length 13
4671 x 15231 image, 32-bit RGB+alpha, non-interlaced
chunk pHYs at offset 0x00025, length 9: 11811x11811 pixels/meter (300 dpi)
chunk iTXt at offset 0x0003a, length 1481, keyword: XML:com.adobe.xmp
uncompressed, no language tag
no translated keyword, 1460 bytes of UTF-8 text
chunk IDAT at offset 0x0060f, length 1048576
zlib: deflated, 32K window, default compression
chunk IDAT at offset 0x10061b, length 879953
chunk IEND at offset 0x1d7378, length 0
No errors detected in dagger.png (6 chunks, 99.3% compression).
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