无法添加webdav地址，提示“输入的文件夹似乎无效。请选择另一个”

如果WebDAV不是https的，win7~10默认是添加不上的，需要修改注册表使得win7~10同时支持http和https，默认只支持https.

修改注册表：
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\WebClient\Parameters
把BasicAuthLevel 值改成2，即同时支持http和https，默认只支持https，

也可以复制以下代码存为1.reg，然后双击导入

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\WebClient\Parameters]
"AcceptOfficeAndTahoeServers"=dword:00000001
"BasicAuthLevel"=dword:00000002
"ClientDebug"=dword:00000000
"FileAttributesLimitInBytes"=dword:000f4240
"FileSizeLimitInBytes"=dword:02faf080
"InternetServerTimeoutInSec"=dword:0000001e
"LocalServerTimeoutInSec"=dword:0000000f
"SendReceiveTimeoutInSec"=dword:0000003c
"ServerNotFoundCacheLifeTimeInSec"=dword:0000003c
"ServiceDebug"=dword:00000000
"ServiceDll"=hex(2):25,00,53,00,79,00,73,00,74,00,65,00,6d,00,52,00,6f,00,6f,\
  00,74,00,25,00,5c,00,53,00,79,00,73,00,74,00,65,00,6d,00,33,00,32,00,5c,00,\
  77,00,65,00,62,00,63,00,6c,00,6e,00,74,00,2e,00,64,00,6c,00,6c,00,00,00
"ServiceDllUnloadOnStop"=dword:00000001
"SupportLocking"=dword:00000001

然后重启服务（win10需要以管理员身份运行）：

net stop webclient
net start webclient

最后再次通过点“计算机”-》右键-》“映射网络驱动器”，就可以添加成功了。