Fireworks CS4 version has introduced defining the roundness of rectangles in either pixels or in percentage values. However in Fireworks CS3 the roundness could be defined only in percentage numbers.
In Fireworks CS4 if you are working with pixel values and a CS3 version file is opened, all the rectangles will loose the roundness information and have sharp corners.
To work around this just create a new rectangle and define the roundness in percentage and then open the CS3 version created fireworks png files. This will solve the issue.
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