i have Office 97 installed on this XP machine
folders are 10,11,12,14
they all have a RICHED20.DLL file
also - have RichEd20.dll in windows\system32
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looking at an older drive with no office installed (also XP MCE2005)....
it has an OFFICE11 folder, which was created when installing an msxml5 update
it has no richedit dll
it also has an OFFICE12 folder - it seems to have been created when installing the PPT viewer
it has RichEd20.dll
in the windows\system32 folder, there is a RichEdit20.dll
it appears to have been present at initial build, which was SP2 on this machine (before installing SP3)
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for XP SP3 users, there is a KB to update the DLL
http://support.microsoft.com/kb/953024which i installed on my current drive, at some point