将下面代码粘贴到记事本，保存为*.reg,然后导入到注册表即可
Windows Registry Editor Version 5.00
[HKEY_CLASSES_ROOT\MIME\Database\Content Type\image/png]
"Extension"=".png"
"Image Filter CLSID"="{A3CCEDF7-2DE2-11D0-86F4-00A0C913F750}"
[HKEY_CLASSES_ROOT\MIME\Database\Content Type\image/png\Bits]
"0"=hex:08,00,00,00,ff,ff,ff,ff,ff,ff,ff,ff,89,50,4e,47,0d,0a,1a,0a
