I have several thousand RAW and CR2 files. Upwards of 10,000 now, I think. I never delete anything, and thanks to various backups when moving systems etc., I now have lots of duplicate files laying ...
FWIW, I occasionally use IrfanView to view RAW files from a 20D, and I don't think it's ever rotated them for me. I always have all of the plugins installed.
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