Did you just find a download or a file on your computer that is digitally signed by Johannes Lutz? If so, please read on.
You'll typically notice Johannes Lutz 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 view the additional details from the Johannes Lutz digital signature with the following procedure:
Here's a screenshot of a file that has been signed by Johannes Lutz:

As you can see in the screenshot above, the Windows OS states that "This digital signature is OK". This implies that the file has been published by Johannes Lutz 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, etc. You can also view the address for Johannes Lutz, such as the street name, city and country.
COMODO RSA Code Signing CA has issued the Johannes Lutz certificates. You can also examine the details of the issuer by clicking the View Certificate button shown in the screenshot above.
The following are the Johannes Lutz files I've collected, thanks to the FreeFixer users.
| Detection Ratio | File Name |
|---|---|
| 0/57 | _iu14d2n.tmp |
The detection percentage is based on the fact that I have collected 57 scan reports for the Johannes Lutz files. 0 of these scan results came up with some sort of detection. If you like, you can view 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: