We are unable to resolve bugs in third-party software so you will have to take this issue up with the vendors of those products.
We do take reports of issues seriously but heuristic-based malware scores are not an actionable item while being inherently prone to false positives. Note also that the "new" executable you linked is the launcher that selects between the 32-bit (Windows XP or newer) and 64-bit (Windows Vista or newer) variants of the main arx.exe while the old is the main 64-bit arx.exe. This launcher arx.exe is only 194 KB in size, most of which is used by the icon, and I have previously verified that it contains no malicious code. You are welcome to do your own analysis of this file or hire a third party to do it for you.
dscharrer
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