Anyway is really changing over time. I decided to retry Microsoft Defender
reaction to Nim > 1.4.4 and I found no issue. I've recompiled a bunch of small
programs I developed at work on my home laptop with Nim 1.6.6 ad none was
detected as malicious by MS. So I made them to be scanned also on my working
laptop (Corporate MS AV may differ), and no issue either. I've checked also on
VirusTotal and apparently Microsoft does not identify malware anymore also on
"old" 1.4.8 .exe like nimble / nimgrep. So maybe MS has done something and it's
more a problem of virus definition / criteria update. Unfortunately on
VirusTotal there is still some AV detecting issues (Cynet, Ikarus and Google)
on 1.6.6 binaries... they are just 3 out of 70.