cd /d D:\
set dir_name="这是一个名字很长的的文件夹，但其还不会超出MAX_PATH(256)_this is a folder with long name, but its path would not exceed MAX_PATH____________________________________________________________"
set file_name="这是一个名字很长的文件，若和上面的folder同级仍可正常预览，但移动到folder内后就不行了_this is a file with long name. When placed in the same level with folder above, it can be previewed normally. But when placed in the folder above, it cannot.html"

mkdir %dir_name%
echo "content of html" > %file_name%
move %file_name% %dir_name%