发现隐藏文件夹无法显示，修改了文件夹属性后仍不显示，重新打开文件夹属性时，发现还是不显示隐藏文件夹。
解决办法：直接该注册表项。
注册项：HKEY_LOCAL_MACHINE/SOFTWARE/Microsoft/Windows/CurrentVersion/Explorer/HKEY_LOCAL_MACHINE/SOFTWARE/Microsoft/Windows/CurrentVersion/Explorer/Advanced/HKEY_LOCAL_MACHINE/SOFTWARE/Microsoft/Windows/CurrentVersion/Explorer/Advanced/Folder/HKEY_LOCAL_MACHINE/SOFTWARE/Microsoft/Windows/CurrentVersion/Explorer/Advanced/Folder/Hidden/HKEY_LOCAL_MACHINE/SOFTWARE/Microsoft/Windows/CurrentVersion/Explorer/Advanced/Folder/Hidden/SHOWALL/
将CheckedValue项的值改为1，就可以重新修改文件夹属性了。