I gathered from the Internet on the PNG format, including PNG' s technical documentation, and PNG file structure analysis of

PNG\PNG (Portable Network Graphics) Specification Version 1.0.pdf
...\PNG (Portable Network Graphics) Specification Version 2.0.html
...\........................................................._files\fig41.png
...\...............................................................\fig41.svg
...\...............................................................\fig410.png
...\...............................................................\fig410.svg
...\...............................................................\fig42.png
...\...............................................................\fig42.svg
...\...............................................................\fig43.png
...\...............................................................\fig43.svg
...\...............................................................\fig44.png
...\...............................................................\fig44.svg
...\...............................................................\fig45.png
...\...............................................................\fig45.svg
...\...............................................................\fig46.png
...\...............................................................\fig46.svg
...\...............................................................\fig47.png
...\...............................................................\fig47.svg
...\...............................................................\fig48.png
...\...............................................................\fig48.svg
...\...............................................................\fig49.png
...\...............................................................\fig49.svg
...\...............................................................\fig51.png
...\...............................................................\fig51.svg
...\...............................................................\fig52.png
...\...............................................................\fig52.svg
...\...............................................................\fig53.png
...\...............................................................\fig53.svg
...\...............................................................\fig71.png
...\...............................................................\fig71.svg
...\...............................................................\fig91.png
...\...............................................................\fig91.svg
...\...............................................................\isostyle.css
...\...............................................................\Thumbs.db
...\...............................................................\W3C-REC.css
...\...............................................................\w3c_home.png
...\png_百度百科，全球最大中文百科全书.files\0db52fad8336601f4a36d654.jpg
...\........................................\bksuggestion.js
...\........................................\logo-baike.gif
...\........................................\my_ico.gif
...\........................................\usertracker.js
...\........................................\view.css
...\........................................\view.js
...\png_百度百科，全球最大中文百科全书.htm
...\PNG技术文档.pdf
...\PNG文件结构分析.doc
...\PNG文件结构分析.pdf
...\Portable Network Graphic Format.doc
...\The PNG Image File Format.files\envelopeopen.png
...\...............................\ffilogo.png
...\...............................\print.png
...\...............................\screen.css
...\...............................\show_ads.js
...\...............................\t-folder.png
...\The PNG Image File Format.htm
...\PNG (Portable Network Graphics) Specification Version 2.0_files
...\png_百度百科，全球最大中文百科全书.files
...\The PNG Image File Format.files
PNG

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