Did you just find a file that is digitally signed by American Megatrends India Private Limited? If so, please read on.
You will typically notice American Megatrends India Private Limited when running the file. The publisher name shows up as the "Verified publisher" in the UAC dialog as the screenshot shows:

You can also view the American Megatrends India Private Limited certificate with the following procedure:
Here is a screenshot of a file that has been digitally signed by American Megatrends India Private Limited:

As you can see in the screencap above, Windows states that "This digital signature is OK". This implies that the file has been published by American Megatrends India Private Limited 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 view the address for American Megatrends India Private Limited, such as the street name, city and country.
VeriSign Class 3 Code Signing 2009-2 CA has issued the American Megatrends India Private Limited certificates. You can also view the details of the issuer by clicking the View Certificate button shown in the screengrab above.
The following are the American Megatrends India Private Limited files I have gathered, thanks to the FreeFixer users.
| Detection Ratio | File Name |
|---|---|
| 0/56 | ami_ipower.sys |
The detection percentage is based on that I have collected 56 scan results for the American Megatrends India Private Limited files. 0 of these scan reports came up with some sort of detection. You can review the full details of the scan reports by examining the files listed above.
The analysis is done on certificates with the following serial numbers: