ZIPFS not working. fopen always returning NULL

Hi,

I'm using Quartus/NIOS 9.1 with SP1 and I'm trying read a binary file using Zip File System. I'm using the Legacy NIOS IDE and for test my code is:

# include "sys/alt_stdio.h"
# include "system.h"
# include <stdio.h>
# include <string.h>
# include "altera_avalon_cfi_flash.h"
# include "altera_ro_zipfs.h"
# include "alt_types.h"
int main(void)
{
    ... Some Code ....
    FILE *pf= fopen("/mnt/rozipfs/screen.bmp","rb");
    
    if(pf  == NULL)
    {
        printf("File Error");
    }
    fread(imageDataOrigin, sizeof(float),307200,pf);
    ... More Code ... 
}

I create the uncompressed Zip file using pkzip -e0 zipname files...

After, I added the file to _syslib of project and activate the ZIPFS in Properties -> System Library -> ZIPFS.

However when execute my program, I can't open my file.

What I'm doing wrong?

Thanks.