Did you just run into a download or a file on your computer that has a digital signature from Valve Corporation? If that's the case, please read on.
You will typically notice Valve Corporation when running the file. The publisher name is then displayed as the "Verified publisher" in the UAC dialog as the screenshot shows:

You can also view the Valve Corporation certificate with the following steps:
Here is a screengrab of a file signed by Valve Corporation:

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 Valve Corporation and that the file has not been tampered with.
If you click the View Certificate button shown in the screenshot above, you can view 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 view the address for Valve Corporation, such as the street name, city and country.
VeriSign Class 3 Code Signing 2010 CA has issued the Valve Corporation certificates. You can also view the details of the issuer by clicking the View Certificate button shown in the screenshot above.
The following are the Valve Corporation files I have collected, thanks to the FreeFixer users.Unfortunately I don't have any scan result from VirusTotal available for the Valve Corporation files at the moment. The scan results will appear here as soon as a FreeFixer user uploads a file digitally signed by Valve Corporation.
| Detection Ratio | File Name |
|---|---|
| Not available | HMA.exe |
| Not available | client.dll |
The analysis is done on certificates with the following serial numbers: