doc iconGi extension is associated with Global Image - Cd backup file. You can open gi files with RecordNow, PowerISO or UltraIso softwares.

Gi extension stands for cd backup file. These file format can be written by various cd back up softwares. You have chance to open gi files with PowerISO software. Besides, you can write gi files on a CD with RecordNow, UltraIso or IsoBuster softwares. 
To get detailed information about Poweriso you may take a look its web page here:

What to use GI

RecordNow, PowerISO, UltraISO, IsoBuster

which page related to GI file

GI Related Searches

You can check related links about GI fileextension.