could anyone tell me what it is?

I found that some applications like svchost,msn,etc ,will modify a file which is \SystemRoot\AppPatch\sysmain.sdb
I am not sure what it is and whether I should allow

Hi Mr.Zero & Welcome to the forums.

It’s an appfix package, In other words it’s part of Microsoft - It’s safe.

Josh

hi Mr.Zero, In the future if you are unsure of a file you can upload it to www.virustotal.com and http://camas.comodo.com/cgi-bin/submit

thanks so much~
and if other applications also want to modify this file,should I allow or block it?