Did you just stumble upon a download or a file on your computer that has a digital signature from Yamaha? If so, please read on.
You will typically see Yamaha 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 Yamaha digital signature with the following procedure:
Here's a screenshot of a file that has been digitally signed by Yamaha:

As you can see in the screencap above, Windows states that "This digital signature is OK". This means that the file has been published by Yamaha and that no one has tampered with the file.
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, etc. You can also examine the address for Yamaha, such as the street name, city and country.
VeriSign Class 3 Code Signing 2010 CA has issued the Yamaha certificates. You can also view the details of the issuer by clicking the View Certificate button shown in the screenshot above.
These are the Yamaha files I have gathered, thanks to the FreeFixer users.
| Detection Ratio | File Name |
|---|---|
| 0/51 | YamahaAE.dll |
| 0/57 | YamahaAE2.dll |
| 0/52 | YamahaAE.dll |
| 0/53 | YamahaAE2.dll |
| 0/56 | YamahaAE2.dll |
| 0/64 | YamahaAE2.dll |
| 0/65 | YamahaAE.dll |
| 0/56 | YamahaAE2.dll |
| 0/55 | YamahaAE.dll |
| 0/62 | YamahaAE2.dll |
The detection percentage is based on that I have gathered 633 scan reports for the Yamaha files. 0 of these scan results came up with some sort of detection. If you like, you can review the full details of the scan results by examining the files listed above.
The analysis is based on certificates with the following serial numbers: