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I have received a *.lpk file from Esri's ArcGIS platform that I would like to convert to a shapefile.

How can I do this, using only free software?

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The lpk I recently attempted to open was a 7z compressed file, it offers very good compression but it isn't possible to open it on the default zip client on Windows 7 64 bit, 7Zip is a good Windows client for opening it. The currently available ArcGIS Explorer Build 1750 also fails to open this lpk, I hope the new Build 2500 which is should be available soon addresses this. – seumas Feb 11 '13 at 11:58

I don't think I've ever seen this officially documented, but a layer package is a zip file that contains a .lyr file and a file geodatabase. You can change the file extension to .zip, unzip it and then, if the layer package was create with 10, read/export features to shapefiles using OGR.

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Per @seumas above, note that this currently appears to use 7z, not zip. – nrabinowitz Oct 28 '13 at 17:12

LPK is a proprietary layer package (zip file) made by ESRI.
I stand corrected. See Zach's answer
Converting to shape file is another matter.
If the originating data is gdb then the resulting lpk unzips to a file gdb. HTH

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In case you have ArcGIS installed, then open the LPK layer file in ArcMap. Select the layer and right click and then click "Data" menu item and then click "Export Data" sub-menu-item. You can select the format of the output file.

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