Missing INT21h functions

[davep]

Trying (more in hope than expectation) to run an ancient DOS program under 
Wine, I get this failure:

err:int21:DOS3Call int21: unknown/not implemented parameters:
int21: AX 0f9f, BX 005c, CX 0000, DX 005c, SI 008e, DI 005c, DS 107f, ES 109f

Sure enough, DOS3Call() has a series of functions, including 0fh, which are 
unimplemented.

Is there any reason why these functions should not be implemented? The win31 
sdk doesn't mention any restrictions on which INT21 functions can be used, 
neither does Schulman.

Dave Pickles