Different icons are used in the Project Workspace — Files page to show the attributes of files and file groups.
Files that are translated and linked into the project.
Files that are excluded from the linkage. This is typical for documents and text files. However, you may exclude other files in the project by unchecking Include in Target Build in the Properties dialog.
Read only files. It is common to see this icon for files that are checked into a Software Version Control System.
Files with specific options are marked with three vertical red dots.
Groups with specific options are marked with three vertical red dots.
Notes
The different icons indicate the tool settings in the various targets of a project. The icons reflect always the attributes of the current selected target. For example, if you have set specific options on a file or file group in one target, then the dots in the icon are only shown if this target is currently selected.