change-major-mode-with-file-namechange-major-mode-with-file-name is a variable defined in `
files.el'. Its value is
tDocumentation: Non-nil means C-x C-w should set the major mode from the file name. However, the mode will not be changed if (1) a local variables list or the `-*-' line specifies a major mode, or (2) the current major mode is a "special" mode, not suitable for ordinary files, or (3) the new file name does not particularly specify any mode. You can customize this variable.