Release 10.1A: OpenEdge Getting Started:
Object-oriented Programming

> ## Saving and opening class files

> The OpenEdge Procedure Editor Save As dialog box allows a file to be saved as a procedure file (`.p`), a window file (`.w`), an include file (`.i`), or a class file (`.cls`). This allows you to create a class or interface in the procedure editor and save it as a class file.

> Similarly, the OpenEdge Procedure Editor Open File dialog box allows you to filter and open any of the file types that you have saved using the Save As dialog box.

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