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

You can also view the OK Software Ltd. certificate with the following steps:
Here's a screencap of a file signed by OK Software Ltd.:

As you can see in the screenshot above, the Windows OS reports that "This digital signature is OK". This implies that the file has been published by OK Software Ltd. and that the file has not been tampered with.
If you click the View Certificate button shown in the screencap above, you can view 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 OK Software Ltd., such as the street name, city and country.
Thawte Code Signing CA has issued the OK Software Ltd. 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 OK Software Ltd. files I've gathered, thanks to the FreeFixer users.
| Detection Ratio | File Name |
|---|---|
| 1/48 | prio.dll |
| 0/47 | prio.dll |
| 0/68 | prio.dll |
Here's the detection names for the OK Software Ltd. files. I have grouped the detection names by each scanner engine. Thanks to VirusTotal for the scan results.
| Scanner | Detection Names |
|---|---|
| Symantec | WS.Reputation.1 |
The detection percentage is based on that I have collected 163 scan reports for the OK Software Ltd. files. 1 of these scan reports came up with some sort of detection. If you like, you can view 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: