For some reason Avast identifies it as a virus.
I contacted the publisher and got the following answer:
Drazick,
Thank you for contacting me regarding your concern about PhotoResize Options EX and a possible virus threat.
PhotoResize Options is completely safe and has been scanned extensively for any possible virus threats. AVAST is reporting a false positive based on the UPX packing system utilized by AutoIt, the program used to create PhotoResize Options. A little information on the UPX topic can be read in this Kaspersky Lab Forum: http://forum.kaspersky.com/lofiversion/index.php/t47187.html
As you can see from the (attached) scan I performed today (which used 20 different Anti-virus programs) only AVAST reported a possible infection. You can also see in the report that even Kaspersky no longer identifies UPX packers as a possible threat.
I hope this relieves your concern about PhotoResize Options and that you will continue to use it. It really is a fast and easy way to quality resizing. Please let me know if you have any other questions.
As a workaround, you can add these files to the Standard Shield provider (on-access scanning) exclusion list.
Left click the ‘a’ blue icon, click on the provider icon at left and then Customize. Go to Advanced tab and click on Add button…
You can use wildcards like * and ?. But be careful, you should ‘exclude’ that many files that let your system in danger.
You could also check the offending/suspect file at: VirusTotal - Multi engine on-line virus scanner and report the findings here. You can’t do this with the file securely in the chest, you need to extract it to a temporary (not original) location first, see below.
Create a folder called Suspect in the C:\ drive, e.g. C:\Suspect. Now exclude that folder in the Standard Shield, Customize, Advanced, Add, type (or copy and paste) C:\Suspect* That will stop the standard shield scanning any file you put in that folder. You should now be able to export any file in the chest to this folder and upload it to VirusTotal without avast alerting.