What is an ".IDF" file?

CircuitWorks reads and writes IDF files. IDF stands for Intermediate Data Format, and was designed as a neutral format for exchanging PCA (Printed Circuit embly) information between PCB layout design (ECAD) systems like Altium and Allegro and Mechanical CAD systems such as SolidWorks. The IDF file format was originally developed in 1992 and has evolved ever since. The current version of the file format is IDF 4.0, but most systems still read and write the earlier IDF 2.0 and IDF 3.0 formats. CircuitWorks can read and write all three versions in use.