What is the DR4 file format?
A file with the .DR4 extension is a file known as AllyCAD Drawing. It belongs to the 3D Image Files category. This format is associated with Knowledge Base Software.
The reliable way to open a .DR4 file is with software that recognises this exact format, rather than guessing from the file name. If you are not sure what created a file, our file identifier can read its first bytes and name the real format, even when the file has been renamed.
We are still gathering the list of programs that open .DR4 files. A fully verified, hand-written description of this format is being prepared; until then, the details on this page are drawn directly from our database.
Format details
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