.TOP File Extension
File Type 1Gromacs Topology File
What is a TOP file?
Data file created by Gromacs, a molecular data analysis application; contains a molecular topology, which formally describes the structure of a molecule; created by pdb2gmx, a program that generates topologies from Protein Data Bank (.PDB) and Residue Topology Parameter (.RTP) files.
Programs that open TOP files
File Type 2TopSolid Design Document
.TOP File Association 2
CAD file created by TopSolid, a program used for CAD design and PDM (product data management); stores a CAD drawing, which is comprised of one or more parts; includes the 3D geometry of the part models and may include Bill of Materials (BoM) information as well.
TOP files can be viewed with Missler's free TopSolid'Viewer CAD viewing software.