I didnt have any r4* files on the card except for your r4.dat now
i have _DS_MENU.DAT
ttmenu.dat
ttmenu.sys
i only have 2 small r4 files in the dir TTMENU
no clue which it actually uses to boot up :/
btw my card is like i said r4 sdhc... its OLD, and came out long before 1.4 existed