FastStone Image Viewer
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Full user review
"Superb image viewer"
Great fullscreen mode with popup menus on mouseover edges, the best I've seen yet.
No unicode support, cannot read asian/characters in filenames. This would be my main viewer IF it had unicode support, I don't want to rename all my files just to adjust to the non-unicode state.
Wished it had unicode support. Cannot say about editing features since I don't use them.