static extern bool SetFileAttributes(string lpFileName, uint dwFileAttributes);

static extern bool SetFileAttributes(

SetFileAttributes("pathname", FileAttributes.System | FileAttributes.Hidden | FileAttributes.Archive);

private static extern bool SetFileAttributesW(string lpFileName, FileAttributes dwFileAttributes);

public static void SetFileAttributes(String path, FileAttributes dwFileAttributeFlags)

      if (!SetFileAttributesW(UnicodeHeader + path, dwFileAttributeFlags))

    public static extern int CeSetFileAttributes(string lpPathName, System.IO.FileAttributes dwAttributes);

Declare Function CeSetFileAttributes Lib "rapi.dll" (TODO) As TODO

Microsoft doc link: http://msdn.microsoft.com/library/default.asp?url=/library/en-us/wceactsy/html/cerefCeSetFileAttributesRAPI.asp