Open Multi-Part Backup-File

[jdfkfnkjk]

Hi there,

I try to convert a Plesk 8.0 Backup to a Plesk 9.2.1 Backup with pre9-backup-convert tool.
After converting I got the Error "Not a valid backup file".
I found the following Article in the KnowledgeBase: http://kb.odin.com/en/5960.
My Backup file is splitted in 5 files, named as followed:
testbackup.psa
testbackup.psa.001
testbackup.psa.002
testbackup.psa.003
testbackup.psa.004
Each File is arround 1 GB.
I made the backupfiles wit the following command on the Plesk 8.0 Machine:
/usr/local/psa/bin/pleskbackup all <backup-file>

How can I now open the multi-part Backuparchive to edit the file mentioned in the KB Article?
Thanks ...

killer