.dll files i fs9 folder

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Hello,I noticed that several .dll files in my FS9 folder also are found in the System32 folder. The files in duplicate are (in my case anyhow):mfc70.dll, msvcp70.dll, msvcr70.dll, msxml4.dll, msxml4r.dll, oleacc.dll and riched20.dll.I don't know if these files are installed together with some planes och sceneries I bought. But, my question is, shouldn't it be enough with just one of them (in the System32 folder)? Can performance be affected in a negative way because of these duplicates? Or is this the way it is supposed to be. When I took them away I think I got a substantial increase in performance (but it was quite late so I was too tired for some real testing), but on the other hand one of the sceneries did not work after that./Krister RUppsala, Sweden