Did you just run into a file that has a digital signature from PC DYNAMICS INC.? If so, please read on.
You will typically notice PC DYNAMICS INC. when clicking to run 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 PC DYNAMICS INC. certificate with the following procedure:
Here's a screencap of a file that has been signed by PC DYNAMICS 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 PC DYNAMICS INC. and that no one has tampered with the file.
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 examine the address for PC DYNAMICS INC., such as the street name, city and country.
GlobalSign ObjectSign CA and GlobalSign CodeSigning CA - G2 has issued the PC DYNAMICS INC. certificates. You can also see the details of the issuer by clicking the View Certificate button shown in the screenshot above.
The following are the PC DYNAMICS INC. files I have collected, thanks to the FreeFixer users.
| Detection Ratio | File Name |
|---|---|
| 0/44 | safdsknt.sys |
| 0/71 | safdsknt.sys |
The detection percentage is based on the fact that I've collected 115 scan reports for the PC DYNAMICS 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 results by examining the files listed above.
The analysis is done on certificates with the following serial numbers: