I went to www.curse.com, and by reading the forums there, discovered that there are other users who have both curseclient.exe and Avast who are experiencing an identical issue just since the last virus definitions update. Some of them listed steps in those forums which allowed me to add curseclient.exe to the list of exeptions correctly, so that I can run the program again. I already submitted the file as a false positive by clicking the link on the virus warning message I got from Avast. I scanned the file in question with VirusTotal, as suggested here, and it gave the results of 0/43 when it was finished. I take it that the next step would be to send the file in a zipped, password protected format, to the above listed email address?