Did you just run into a download or a file on your computer that is digitally signed by ACD Systems International? If so, please read on.
You will probably see ACD Systems International when running the file. The publisher name is displayed as the "Verified publisher" in the UAC dialog as the screenshot shows:

You can view additional details from the ACD Systems International certificate with the following procedure:
Here's a screengrab of a file digitally signed by ACD Systems International:

As you can see in the screenshot above, the Windows OS states that "This digital signature is OK". This means that the file has been published by ACD Systems International and that no one has tampered with the file.
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 see the address for ACD Systems International, such as the street name, city and country.
VeriSign Class 3 Code Signing 2010 CA and Symantec Class 3 SHA256 Code Signing CA has issued the ACD Systems International certificates. You can also view the details of the issuer by clicking the View Certificate button shown in the screenshot above.
These are the ACD Systems International files I've gathered, thanks to the FreeFixer users.
| Detection Ratio | File Name |
|---|---|
| 0/56 | ACDSeeCommander18.exe |
| 0/55 | acdIDInTouch2.exe |
| 0/55 | acdIDInTouch2.exe |
| 0/57 | ACDSeeCommanderPro9.exe |
| 0/57 | acdIDInTouch2.exe |
| 0/56 | ACDSeePVPS.dll |
| 0/54 | ACDSeePVPS.dll |
| 0/57 | cdf69.rbf |
| 0/53 | ACDSeeShopNow_E9A166E7AB2F4717B60E66A26F14B453.exe |
| 0/57 | ACDSeeCommanderPro8.exe |
The detection percentage is based on the fact that I have gathered 988 scan reports for the ACD Systems International files. 0 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 is done on certificates with the following serial numbers: