You can upload your files to 3DContentCentral.com (assuming they're not too big, and are free of errors). Then, once processed, you can re-download them as 2010 files (or any other file type.
The only way is to export a dumb solid (in order of preference > Parasolid, STEP or IGES) and then use FeatureWorks (a feature recognition add-in) to rebuild to an editable part.
A dumb solid can be edited using the SW surface manipulation tools, but is not as simple as the regular features.
You can upload your files to 3DContentCentral.com (assuming they're not too big, and are free of errors). Then, once processed, you can re-download them as 2010 files (or any other file type.
Good luck,
Dan