Did you just run into a file that has a digital signature from BT MOBILE PRIVATE LIMITED? If that's the case, please read on.
You will probably see BT MOBILE PRIVATE LIMITED when running the file. The publisher name is displayed as the "Verified publisher" in the UAC dialog as the screengrab shows:

You can view the additional details from the BT MOBILE PRIVATE LIMITED digital signature with the following procedure:
Here is a screengrab of a file that has been signed by BT MOBILE PRIVATE LIMITED:

As you can see in the screengrab above, Windows reports that "This digital signature is OK". This implies that the file has been published by BT MOBILE PRIVATE LIMITED 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, etc. You can also see the address for BT MOBILE PRIVATE LIMITED, such as the street name, city and country.
Thawte Code Signing CA - G2 has issued the BT MOBILE PRIVATE LIMITED certificates. You can also examine the details of the issuer by clicking the View Certificate button shown in the screencap above.
These are the BT MOBILE PRIVATE LIMITED files I've gathered, thanks to the FreeFixer users.
| Detection Ratio | File Name |
|---|---|
| 0/38 | gaupsvc.exe |
The detection percentage is based on that I've gathered 38 scan results for the BT MOBILE PRIVATE LIMITED files. 0 of these scan results came up with some sort of detection. You can view the full details of the scan reports by examining the files listed above.
The analysis is done on certificates with the following serial numbers: