[DllImport("shlwapi.dll", EntryPoint = "PathIsURLW",  SetLastError = True, CharSet = CharSet.Unicode)]

static extern bool PathIsURL([MarshalAs(UnmanagedType.LPTStr)]string pszPath);

<DllImport("shlwapi.dll", EntryPoint:="PathIsURLW",  SetLastError:=True, CharSet:=CharSet.Unicode)> _

Public Function PathIsURL(<MarshalAs(UnmanagedType.LPTStr)>pszPath As String) As <MarshalAs(UnmanagedType.Bool)> Boolean

Public Declare Function PathIsURL Lib "shlwapi" Alias "PathIsURLA" _