.SPG File Extension
File TypeTCP Optimizer Backup File
What is an SPG file?
Contains a backup configuration of network settings created with TCP Optimizer, a utility developed by SpeedGuide.net; may be used to restore a previous system state; can be opened by selecting "File→Restore backed up settings" within TCP Optimizer.
TCP Optimizer 2 and later automatically backs up previous network settings in a file named "sg_backup_[date]-[time].spg."