Did you just stumble upon a file that has a digital signature from 4G Systems GmbH & Co. KG? If that's the case, please read on.
You will probably see 4G Systems GmbH & Co. KG when running the file. The publisher name shows up as the "Verified publisher" in the UAC dialog as the screenshot shows:

You can view the additional details from the 4G Systems GmbH & Co. KG digital signature with the following procedure:
Here's a screenshot of a file that has been signed by 4G Systems GmbH & Co. KG:

As you can see in the screenshot above, the Windows OS reports that "This digital signature is OK". This means that the file has been published by 4G Systems GmbH & Co. KG 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, and so on. You can also view the address for 4G Systems GmbH & Co. KG, such as the street name, city and country.
UTN-USERFirst-Object and COMODO Code Signing CA 2 has issued the 4G Systems GmbH & Co. KG certificates. You can also examine the details of the issuer by clicking the View Certificate button shown in the screencap above.
The following are the 4G Systems GmbH & Co. KG files I've gathered, thanks to the FreeFixer users.
| Detection Ratio | File Name |
|---|---|
| 0/46 | service4g.exe |
| 0/51 | service4g.exe |
| 0/47 | wtgservice.exe |
| 0/47 | starter4g.exe |
| 0/43 | starter4g.exe |
| 0/47 | service4g.exe |
| 0/50 | starter4g.exe |
| 0/51 | wtgservice.exe |
| 0/54 | service4g.exe |
| 0/55 | starter4g.exe |
The detection percentage is based on the fact that I have collected 491 scan reports for the 4G Systems GmbH & Co. KG files. 0 of these scan results 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: