Did you just run into a file that has been digitally signed by Xfire? If so, please read on.
You will probably see Xfire when running the file. The publisher name shows up as the "Verified publisher" in the UAC dialog as the screengrab shows:

You can view the digital signature details for Xfire with the following procedure:
Here is a screenshot of a file that has been digitally signed by Xfire:

As you can see in the screenshot above, Windows states that "This digital signature is OK". This means that the file has been published by Xfire and that no one has tampered with the file.
If you click the View Certificate button shown in the screenshot above, you can examine all the details of the certificate, such as when it was issued, who issued the certificate, how long it is valid, etc. You can also examine the address for Xfire, such as the street name, city and country.
VeriSign Class 3 Code Signing 2009-2 CA and VeriSign Class 3 Code Signing 2004 CA has issued the Xfire certificates. You can also examine the details of the issuer by clicking the View Certificate button shown in the screenshot above.
The following are the Xfire files I have collected, thanks to the FreeFixer users.
| Detection Ratio | File Name |
|---|---|
| 0/41 | xfire_toucan_44225.dll |
| 0/41 | Xfire.exe |
| 0/57 | Xfire.exe |
| 0/31 | Xfire.exe |
| 0/51 | Xfire.exe |
| 0/40 | Xfire.exe |
| 0/54 | Xfire.exe |
| 0/56 | xfire.exe |
The detection percentage is based on that I have collected 371 scan results for the Xfire 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 has been done on certificates with the following serial numbers: