Browsing for a source file in the Intel® System Debugger means choosing a file referenced by the loaded debug information.
Browsing for an arbitrary source file from the file system to view, as in a programmer's editor, is not possible in the debugger.
To view the source files described by the debug information, select View > Source Files.
The Source Files window is opened, displaying the files in a tree view that corresponds to the file system paths encoded into the debug information. Double-click a file to open it.