Did you just run into a file that has been digitally signed by Nanjing Naga Software Ltd.? If so, please read on.
You will probably see Nanjing Naga Software Ltd. when clicking to run the file. The publisher name is displayed as the "Verified publisher" in the UAC dialog as the screenshot shows:

You can view additional details from the Nanjing Naga Software Ltd. certificate with the following steps:
Here is a screenshot of a file digitally signed by Nanjing Naga Software Ltd.:

As you can see in the screengrab above, the Windows OS reports that "This digital signature is OK". This means that the file has been published by Nanjing Naga Software Ltd. and that the file has not been tampered with.
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, and so on. You can also view the address for Nanjing Naga Software Ltd., such as the street name, city and country.
WoSign Code Signing Authority has issued the Nanjing Naga Software Ltd. certificates. You can also view the details of the issuer by clicking the View Certificate button shown in the screenshot above.
These are the Nanjing Naga Software Ltd. files I've gathered, thanks to the FreeFixer users.
| Detection Ratio | File Name |
|---|---|
| 0/55 | VJStream.exe |
The detection percentage is based on the fact that I've collected 55 scan results for the Nanjing Naga Software Ltd. files. 0 of these scan reports 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 has been done on certificates with the following serial numbers: