it could be version dependent. I know mxd's are version dependent, maybe so are the mpks? Sorry, I have no way to test the theory out.http://resources.arcgis.com/en/help/main/10.1/index.html#//006600000403000000there is a caution: Map Packages are supported from ArcGIS for Desktop version 10.0 onwards. Map packages will fail to open with older versions (9.3.1 or older).
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