Did you just find a file that is digitally signed by Michal GDANIEC? If that's the case, please read on.
You will typically notice Michal GDANIEC 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 view additional details from the Michal GDANIEC certificate with the following steps:
Here is a screenshot of a file digitally signed by Michal GDANIEC:

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 Michal GDANIEC and that no one has tampered with the file.
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, etc. You can also view the address for Michal GDANIEC, such as the street name, city and country.
Certum Level III CA has issued the Michal GDANIEC certificates. You can also see the details of the issuer by clicking the View Certificate button shown in the screengrab above.
These are the Michal GDANIEC files I've collected, thanks to the FreeFixer users.Unfortunately I don't have any scan result from VirusTotal available for the Michal GDANIEC files at the moment. The scan results will appear here as soon as a FreeFixer user uploads a file digitally signed by Michal GDANIEC.
| Detection Ratio | File Name |
|---|---|
| Not available | Mario Forever.exe |
The analysis is done on certificates with the following serial numbers: