md expanded
expand *.*_ expanded
del /f /Q *.*_
cd expanded

ren *.cf_ *.cfg
ren *.cn_ *.cnt
ren *.cp_ *.cpl

ren *.da_ *.dat
ren *.dl_ *.dll
ren *.do_ *.doc
ren *.dt_ *.dtd
ren *.dx_ *.dxt

ren *.ei_ *.eif
ren *.ex_ *.exe

ren *.gp_ *.gpd

ren *.hl_ *.hlp
ren *.ht_ *.htm

ren *.ic_ *.icm
ren *.in_ *.ini

ren *.lo_ *.loc
ren *.lu_ *.lut

ren *.ou_ *.out

ren *.pr_ *.prm
;ren *.pr_ *.prn

ren *.sm_ *.smr
ren *.sw_ *.swf
ren *.sy_ *.sys

ren *.tb_ *.tbl
ren *.tv_ *.tvp
ren *.tx_ *.txt

ren *.vi_ *.vif
ren *.vx_ *.vxd

ren *.wb_ *.wbf
ren *.we_ *.web

ren *.xm_ *.xml

move /Y *.* ..
cd ..
rd expanded