Not sure if this has already been mentioned. I searched and came out empty. Anyway, MSXML 4.0 is SP1 if you're current with all the hotfixes and servicepacks, but MSXML 4.0 has SP2 for download. So, maybe for people that likes to have all their files with current versions, this should be included here. There is also a similar Critical Update for 4.0 just like the MSXML 3.0 SP4 update. Also, this is required if you use the newest version of HFNetChk.