On windows Finder uses \ as the directory separator in numerous places which creates a number of issues.

I created a workaround by extending S3's _fixupObjectName() and _makeRequest() functions to replace backslash with forwardslash. However this doesn't seem like a very elegant solution, it would be best if it was possible to stop Finder from creating paths with backslashes.

Note that fixing Finder seemed like much more time consuming prospect than creating a workaround by simply extending S3.

And of course others may feel the problem lies with Zend's S3 and not with Finder, but I imagine this may break other stream wrappers.