Windows cmd 改FILE名問題

有3個FILE:
abcde01.txt
abcde02.txt
abcde03.txt

點名以改成
fg01.txt
fg02.txt
fg03.txt

我用
ren abcde* fg*
會變成
fgcde01.txt
fgcde02.txt
fgcde03.txt
點解會咁.