Need help, how to restore my backup from .bak file?

Hi, please help me, me com accidentally shut down, when I restart back, all my downloading task was gone. The system say to restore from C:Programme File/Bitcomet/downloaps.xml.bak but I totally don’t know how. Pleas help me out… Thank you.

Rename downloads.xml.bak to downloads.xml

The procedures are described in the Wiki FAQ: Tasks have disappeared/deleted tasks reappeared in my tasklist after a BitComet restart. How can I fix this?