How can I display extensions in windows explorer in windows 7? There used to be an option in XP, but I can't find it in Win 7.
1) Press Alt (or Organize>Layout>Menu bar and check it)
2) Select Tools -> Folder options -> view -> Files and Folders (un-click hide extensions for known file types).
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Try (in an Explorer Window) Tools > Folder Options > View Tab > Untick "Hide extensions for known files types".