Antivirus: Don't be too surprised. Onealex includes the h.sie/stiebler executable code mods. The techniques used by them are the same as the ones that bad actors use to slip malware into legitimate programs. The antivirus is only doing its job. There's no virus - as far as I know - but it sure looks like a virus to the tool.
Linux: It's easier to run SH3 on Linux than on Windows these days, but if you don't already run Linux I'm not sure I'd install it just to play SH3. Actually, Linux works well with the stock game and traditional mods, but I have not gotten it to work with widescreen mods due to the widescreen mods using hacks that are difficult to reconcile with WINE.
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