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Why does Unity return a 'Convert of file C:\<example>\<example>.pwx: Converter DLL for this extension not found. Please install it' error?

Unity Pro software versions prior to v7.0 did not include the 984LL converters. Versions between 4.1 and 6.1 included an option have them added with a separate add on purchase and install/license. From Unity Pro V7.0 forward, the converters are included with the standard install.

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