Did you just stumble upon a download or a file on your computer that has been digitally signed by Thornsoft Development, Inc.? If that's the case, please read on.
You will probably see Thornsoft Development, Inc. when running the file. The publisher name is then displayed as the "Verified publisher" in the UAC dialog as the screenshot shows:

You can also view the Thornsoft Development, Inc. certificate with the following procedure:
Here's a screenshot of a file that has been signed by Thornsoft Development, Inc.:

As you can see in the screenshot above, Windows states that "This digital signature is OK". This means that the file has been published by Thornsoft Development, Inc. 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 see the address for Thornsoft Development, Inc., such as the street name, city and country.
COMODO Code Signing CA 2 has issued the Thornsoft Development, Inc. certificates. You can also view the details of the issuer by clicking the View Certificate button shown in the screenshot above.
The following are the Thornsoft Development, Inc. files I've gathered, thanks to the FreeFixer users.
| Detection Ratio | File Name |
|---|---|
| 0/51 | CLIPMA~1.DLL |
| 0/46 | CLIPMA~1.DLL |
| 0/55 | CLIPMA~1.DLL |
The detection percentage is based on the fact that I have collected 152 scan reports for the Thornsoft Development, Inc. 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 reports by examining the files listed above.
The analysis has been done on certificates with the following serial numbers: