Can't emulate 8087 instruction

The Turbo Assembler is set to generate emulated floating-point
instructions, either via the /E command-line option or by using the EMUL
directive, but the current instruction can't be emulated. For example,

   EMUL 
   FNSAVE [WPTR]        ;can't emulate this 

The following instructions are not supported by floating-point emulators:
FNSAVE, FNSTCW, FNSTENV, and FNSTSW.