I found paradox database files with different extension.
There are db file, mb
file, dat
file, px
file, XG0
file, XG1
file, XG2
file, XG3
file, XG4
file, YG0
file, YG1
file, YG2
file, YG3
file and YG4
file.
I already found way to open db file and px file using gnumeric spreadsheet. I found some of needed data from db file. But, rest of data not in db file. So, i have to open rest of files. I cant find software that can read those files.