8.3 backup file extension .33

[damage]

hi,
I'm trying to move my site from plesk 8.3 to another server. I backed up but file name "xxxxx.com_2008.05.15_23.33"
how can i open this file type? I backed up and download twice, but cant fix

sincelery

 

[damage]

I backup again, and change name when i configure backup "xxxx.zip" and I open zip, i unzip file, but no any extension, how can i get my files, from this backup file