problem of CRC_custom_instruction.v

hello,

i would to illistrate exemple of custom instruction,

CRC_custom_instruction.v and CRC_Component.v

located in crc_hw directory

but when i make browser to add these files i don't find it .

but i found others files like :

crcchk.v ,crchk_multichan.v ,tb.v

i work with Quartus II 9.0 sp2 web editor

so if some body have this pb can give me solution ?