I now see the problem you have done a Save As and saved it to the floppy. This was your mistake. Your need to go File/ Backup and then it will compress the file into the *.bak format that PAF 5 will restore as I described before.
The problem going file save as is that there are more than the *.paf files you need to open a PAF data base and the backup combines these togethr for PAF 5 to restore.
In my opinion PAF 5.2.18 makes PAF 4 look like we were writing on Clay Tablets before.
If you would like to send me an email NZPAFUG@xtra.co.nz