## File Tab Options

Several file display and saving options can be controlled from the File tab of the Options->Preferences dialog:

- Show Line Numbers - check (the default) to turn on line numbers in the source view.
- Tab size - the number of blank spaces to use when showing tabs or replacing with spaces.
- New Files as.... - Sets the type of file to create when making a new file.

- PC (Microsoft Windows) line-endings are terminated with a combination of a carriage return (\r) and a newline (\n), also referred to as CR/LF.
- UNIX line-endings are terminated with a newline (\n), also referred to as a linefeed (LF).
- Macintosh line-endings are terminated with a single carriage return (CR).

- Save Files as - whether to force a given file type or to preserve the type the file have before editing. The default is to preserve the type.
- When files are modified externally.... - If an open file is changed through some other program, Understand will detect this. Choose Prompt if you want to be notified and asked to load that changed version. Auto-Reload does this without prompting. Ignore is dangerous and not recommended.
- Before running commands, if modified files... - If a file has been modified, this setting controls the action performed when you run a command. The options are to Prompt you for whether to save, to Automatically save all modified files, or to Ignore modified files.

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