Most mouse function can be "emulated" by using a combination of CTRL, TAB, ENTER and scroll keys. Have a play.
Alternatively, I would boot up in DOS mode and use COPY (or XCOPY) to copy the file from a floppy. (CD drivers may not be available in DOS mode).
e.g. XCOPY a:wpa.dbl c
windows\system32\wpa.dbl
e&oe
