Did you just run into a file that is digitally signed by DDXSoftware Inc.? If so, please read on.
You will typically notice DDXSoftware 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 view the digital signature details for DDXSoftware Inc. with the following steps:
Here is a screenshot of a file signed by DDXSoftware Inc.:

As you can see in the screenshot above, Windows states that "This digital signature is OK". This implies that the file has been published by DDXSoftware Inc. and that no one has tampered with the file.
If you click the View Certificate button shown in the screenshot 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, and so on. You can also view the address for DDXSoftware Inc., such as the street name, city and country.
UTN-USERFirst-Object has issued the DDXSoftware Inc. 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 DDXSoftware Inc. files I've gathered, thanks to the FreeFixer users.Unfortunately I don't have any scan result from VirusTotal available for the DDXSoftware Inc. files at the moment. The scan results will appear here as soon as a FreeFixer user uploads a file digitally signed by DDXSoftware Inc..
| Detection Ratio | File Name |
|---|---|
| Not available | xprepairpro5_standard_x86.exe |
The analysis has been done on certificates with the following serial numbers: