The 4dc file extension is associated with the 4D, a relational database management system and development tool for Microsoft Windows, developed by 4D, Inc.
The 4dc file contains compiled structure data.
How to open:
Use 4D to work with *.4dc files.
How to convert:
As far as we know, this .4dc file type can't be converted to any other file format. This is usually the case of system, configuration, temporary, or data files containing data exclusive to only one software and used for its own purposes. Also some proprietary or closed file formats cannot be converted to more common file types in order to protect the intellectual property of the developer, which is for example the case of some DRM-protected multimedia files.