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I'm developing .net application using wmi and win32_* WQL queries. http://msdn.microsoft.com/en-us/library/aa394084%28VS.85%29.aspx Will such application work on x64?

+2  A: 

Yes. Those class names work the same on 64-bit Windows. The "Win32" part just wasn't changed for compatibility reasons. After all, everything you can query is the same regardless of bit-ness, anyway.

You can easily play around with those in PowerShell and the Get-WmiObject cmdlet. This works without problems for both 32-bit and 64-bit versions of PowerShell (which itself is a .NET program too).

Joey
Bonus point for your edit that adds why Win32 is still called Win32.
OregonGhost