This one is annoying. When you Click Fix in Windows Photo Manager to retouch
a photo and start trying some adjustments, but you decide to bail out. You
just click on the red X of the window to leave without changes, right? Wrong,
Windows SAVES your adjustments without warning or asking for confirmation! I
screwed up a photo this way!

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http://windowshelp.microsoft.com/com...pictures_video

Agreed, a few other programs do the same, but that doesn't make it right.
The user should be informed that they are permanantly changing the file. I
honestly don't see the problem with saving automatically as a copy or
tossing the original file into an ADS (quick, someone patent it!) I realize
the ADS idea is a bit awkward, but if someone had the desire, they could
code up a fairly elegant solution quite quickly. Then again, with ADS there
is that whole "Where is my drive space?" issue.
Just some thoughts...