PK released one patch for WinXP only. Since I don’t have any of those installed, I have no need to apply that patch.

ap2011-17-07-002: Patch for slowdown with RAXCO PerfectDisk/Retrospect/Norton Ghost software, Windows XP only! (Free/Pro/IS)

One patch is for AIS only. Since the OS is not listed, it must be for all Windows version supported.

ap2011-17-07-001: Patch for boot-time defrag issue with RAXCO PerfectDisk (AIS users with installed Firewall component)

The third patch is for ntdll.dll syscall exports and also does not mention the OS targeted.

ap2011-24-07-001: Patch for ntdll.dll syscall exports (Free/Pro/IS)

I haven’t installed this third patch, either. The OS is not mentioned for this patch. So far, I haven’t noticed any problems with Avast Free. If I do have a problem before the forthcoming update, I’ll apply this patch.

I would think that Avast tests their products on all supported operating systems. If the 2 patches that aren’t specifically targeted to WinXP are not for all supported OS, then http://public.avast.com/~kurtin/patches/ should be revised to reflect that.