About FSchdir(char * path ) Function for PIC18 (rocket42)

hello everyone!My framework: MPLAB IDE V8.70, MPLAB C18 V3.31 AND MDDFS LIBRARY V1.4.4 for PIC18f4620I already have read MDDFS Library help about FSchdir(char * path ) function. I seen its description as following:"Changes the current working directory to..