Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for receiving a first source file, the first source file including one or more first computer-aided design models; converting the first source file into a first plurality of files; generating a first snapshot, the first snapshot including the first source file, the first plurality of files, and a first version; receiving a second source file, the second source file having the first format that is readable by the first application, the second source file including one or more second models, the second source file being an updated version of the first source file; converting the second source file into a second plurality of files; generating a second snapshot; and associating the second snapshot with the first snapshot, where the second snapshot being a more recent version than the first snapshot.