NDISulator no work in pfsense???

[burff]

hi sorry for my english but no is my native language
i try install a rtl8185 and marvel yukon 88w8335 with ndisulator.
when i use ndisgen the archive ,inf work good but .sys say

"/usr/sbin/ndisgen: /usr/bin/file: not found

I don't recognize this file format. It may not be a valid .SYS file.
"
any ideas i down drivers from www.realtek.com.tw and www.marvell.com.
in both case same error