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