What is a tlb.tb file?

It's appears after reboot (I think...) at root of disk c:
What is this?

----------------------
Windows Version: Microsoft Windows XP Professional version 5.1.2600 Service Pack 1
Shell Version:6.0.2800.1233
Internet Explorer Version: 6.0.2800.1106
TLB version: 2.2.0.9

.þ

This is backup of current toolbar. You can delete this file, but it will be created again. This is my bug I've forgotten to remove testing code when develop backup/restore feature.

Aaa... OK