Did you just stumble upon a file that is digitally signed by Musecy SM Ltd.? If so, please read on.
You'll typically see Musecy SM Ltd. when double-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 Musecy SM Ltd. certificate with the following steps:
Here is a screengrab of a file that has been signed by Musecy SM Ltd.:

As you can see in the screenshot above, Windows reports that "This digital signature is OK". This implies that the file has been published by Musecy SM 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 see the address for Musecy SM Ltd., such as the street name, city and country.
Sectigo Public Code Signing CA R36 has issued the Musecy SM 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 Musecy SM Ltd. files I have gathered, thanks to the FreeFixer users.Unfortunately I don't have any scan result from VirusTotal available for the Musecy SM Ltd. files at the moment. The scan results will appear here as soon as a FreeFixer user uploads a file digitally signed by Musecy SM Ltd..
| Detection Ratio | File Name |
|---|---|
| Not available | Audacity.exe |
| Not available | museauthservice.exe |
The analysis has been done on certificates with the following serial numbers: