I read the readme.txt for patches marked for download for 9.2.0.5 versions and I think that you can apply these patches for 9.2.0.4 without upgrading to 9.2.0.5 first.
There is the some text from readme.txt for patch 3835964 for Windows(32-bit)
o What version can I apply this patch on?
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-> 9.2.0.5 PSE 3 for Windows and any of the older PSEs (PSE 2 and PSE 1)
-> 9.2.0.4 PSE 6 for Windows and any of the older PSEs (PSE 1-5)
-> And any of 9.2.0.x Oracle Database Releases for Windows
Our systems are patched to 9.2.0.4 and I will patch them directly with two patches for Windows OS platform.
About the question for Windows 2003 you should choose the Windows (64-bit) from the Patch Availability Matrix
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