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If the menu does not correctly display line drawing, you can change some parameters in putty.
Putty version 0.71 and above:
Set the new parameter "UTF8linedraw=1"
- on Linux, add a line in .putty/sessions/yoursession containing this parameter (above)
- on Windows, change settings from "Window" → "Translation" pane and check the button "Enable VT100 line drawing even in UTF-8 mode"
you can keep your locale / codepage as UTF-8
Putty version 0.70 and below:
Change the terminal settings. If : if set to vt100 for example, you will see lowercase characters in place of menu borders.
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