Did you just run into a file that is digitally signed by ActivePath Ltd.? If so, please read on.
You'll probably see ActivePath Ltd. when running the file. The publisher name shows up as the "Verified publisher" in the UAC dialog as the screenshot shows:

You can view the digital signature details for ActivePath Ltd. with the following steps:
Here is a screenshot of a file that has been signed by ActivePath Ltd.:

As you can see in the screencap above, the Windows OS states that "This digital signature is OK". This means that the file has been published by ActivePath Ltd. 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, etc. You can also view the address for ActivePath Ltd., such as the street name, city and country.
VeriSign Class 3 Code Signing 2009-2 CA and VeriSign Class 3 Code Signing 2010 CA has issued the ActivePath Ltd. certificates. You can also examine the details of the issuer by clicking the View Certificate button shown in the screenshot above.
These are the ActivePath Ltd. files I've gathered, thanks to the FreeFixer users.
| Detection Ratio | File Name |
|---|---|
| 0/47 | UpdateClient.exe |
| 0/42 | ActiveMailBHO.dll |
| 0/44 | ActiveMailBHO64.dll |
| 0/44 | ActiveMailBHO64.dll |
| 0/44 | ActiveMailBHO64.dll |
| 0/50 | ActiveMailBHO.dll |
The detection percentage is based on that I have gathered 312 scan results for the ActivePath Ltd. 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 results by examining the files listed above.
The analysis has been done on certificates with the following serial numbers: