here's a piece of code which matches the fid files to the database.
Only the root-playlist doesn't match, all others do... :

#include <fcntl.h>

#include <stdio.h>



#define DBFILE "/empeg/var/database"

#define TAGFILE "/empeg/var/tags"



int main(int argc, char *argv[])

{

        unsigned char   c;

        char    s[2048];

        char    *tags[20];

        int     i,end_entry,db_index;

        FILE    *fp,*fp2;



        fp=fopen(TAGFILE, "rb");

        i=0;

        while (fgets(s,sizeof(s), fp) != NULL) {

                s[strlen(s)-1]='\0';

                tags[i++]=(char *)strdup(s);

        }

        fclose(fp);

        i=0;

        db_index=16;

        fp=fopen(DBFILE, "rb");

        while ( fread(&c,1,1,fp) > 0 ) {

                if ( c == 0xFF ) {

                        end_entry=1;

                } else {

                        if (end_entry) {

                                printf("--------------------------------\n\n");

                                i=db_index << 4 | 1;

                                printf("****************************\n");

                                printf("opening /drive0/fids/%x\n",i);

                                sprintf(s,"/drive0/fids/%x",i);

                                fp2=fopen(s, "rb");

                                if ( fp2 != NULL ) {

                                        while (fgets(s,sizeof(s), fp2) != NULL) {

                                                printf("%s",s);

                                        }

                                        fclose(fp2);

                                }

                                printf("****************************\n");

                                end_entry=0;

                                db_index++;

                        }

                        i=c;

                        fread(&c,1,1,fp);

                        fread(s,1,c,fp);

                        s[c]='\0';

                        printf("%s : %s\n",tags[ i ],s);

                }

        }

        fclose(fp);

}