Uncompress file from Windows 2003 Install CD

Can anyone tell me how to uncompress a file found on the Windows 2003 install CD in I386? Heres the instuctions for what im supposed to do:

Expand the Perfc009.dat file and the Perfh009.dat file. These files are located on the Windows 2000 CD-ROM. The compressed files are found at DriveLetter:\i386\perfc009.da_ and at DriveLetter:\i386\perfh009.da_. Replace the files that are in the %Systemroot%\System32 folder.

I dont know how to make the .da_  a .dat? Does just renaming it work, cause i dont think it would.

this is the link to the whole article:

Who is Participating?
You need to use the expand utility.  Here is a Microsoft Article with instructions...

http://support.microsoft.com/kb/888017 - Method 2


expand <drive>:\i386\perfc009.da_ C:\Windows\System32\perfc009.dat

Or whatever the destination is.
Brian PiercePhotographerCommented:
This article is for XP but 2003 is the same http://support.microsoft.com/kb/888017
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