You can open Endnote libraries created in versions 9 and X1.01 in version X4. They will be converted into the new format which cannot then be reopened in an earlier version.
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Select the file you wish to open in Endnote-a dialog box will open alerting you to the fact that your library will be converted
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The new library will be created as e.g. library-Converted.enl
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A .data folder will be created as part of your new library-do not delete this
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your old library will remain unchanged