INT 21,4F - Find Next Matching File

AH = 4F

DS:DX = unchanged from previous function 4E

on return:

AX = error code if CF set (see ~DOS ERROR CODES~)

- ~INT 21,4E~ should be called to find the first file and this

function should be called to find all other matching files

- normal files are always included along with files that match

the requested attributes except when the LABEL attribute is

requested. It's up to the programmer to determine which

actually match the requested attributes.

- see ~INT 21,1A~ ~DTA~ ~FILE ATTRIBUTES~