Definitely, you could use a meta field to store the path to the uploaded files. For example Thumbnail in the News module serves as a field for saving the image urls. You could find more details how to add custom meta fields in the following topic of the Developer Manual: Add Custom Meta Fields
Regarding your second post, it is not quite clear what exactly you want to achieve. Could you please describe in details? Do you mean that you want to use RadControls for setting/getting the meta field value in the module administration?
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