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### Program Files

The standard extension for a Scheme program file is `.scm`. The extensions `.ss` and `.sch` are also acceptable.

DrScheme's editor can saves a program file in two different formats:

- Plain-text format -- All text editors can read this format. DrScheme saves a program in plain-text format by default, unless the program contains images or text boxes. (Plain-text format does not preserve images or text boxes.)

  Plain-text format is platform-specific because different platforms have different newline conventions. However, most tools for moving files across platforms support a ``text'' transfer mode that adjusts newlines correctly.

- Multimedia format -- This format is specific to DrScheme, and no other editor recognizes it. DrScheme saves a program in multimedia format by default when the program contains images, text boxes, or formatted text.

  Multimedia format is platform-independent. Use a ``binary'' transfer mode when moving multimedia-format files across platforms. (Using ``text'' mode may corrupt the file.)