thanx afm i think i may keep backup files as they were.
and here are some new problems i'd appreciate your help
1 now i am editing c++ file with emacs, is there any way to make emacs highlighted for c++ or other syntax ?
2 and, when i save a c++ source file test.cpp, how to invoke certain compiler to compile it ?
3 in windows i can select certain region by pressing Shift key and moveing cursor together, and how can we select region in emacs ?
4 cut, copy and paste have no shortcut keys ??? i can only see something like "(<cut>)" etc.
5 some commands like colose file etc are usually used, but by default there are no shortcut keys for them, can i customize it ?
6 anywhere can i change indent size ??? default seems to be 8 spaces, but i prefer 4 instead~