Did you just find a file that has a digital signature from Columbitech AB? If so, please read on.
You will probably see Columbitech AB when clicking to run the file. The publisher name is then displayed as the "Verified publisher" in the UAC dialog as the screenshot shows:

You can view the additional details from the Columbitech AB digital signature with the following steps:
Here is a screengrab of a file that has been signed by Columbitech AB:

As you can see in the screenshot above, Windows reports that "This digital signature is OK". This means that the file has been published by Columbitech AB and that the file has not been tampered with.
If you click the View Certificate button shown in the screenshot above, you can see all the details of the certificate, such as when it was issued, who issued the certificate, how long it is valid, and so on. You can also see the address for Columbitech AB, such as the street name, city and country.
VeriSign Class 3 Code Signing 2009-2 CA has issued the Columbitech AB certificates. You can also view the details of the issuer by clicking the View Certificate button shown in the screenshot above.
These are the Columbitech AB files I've gathered, thanks to the FreeFixer users.
| Detection Ratio | File Name |
|---|---|
| 0/44 | ATService.exe |
| 0/43 | Connect.exe |
| 0/45 | WVPNMonitor.exe |
The detection percentage is based on that I've gathered 132 scan reports for the Columbitech AB files. 0 of these scan results came up with some sort of detection. You can view the full details of the scan results by examining the files listed above.
The analysis is based on certificates with the following serial numbers: