since the manual tools know it. So let's just remove them (many were not uptodate with the filemane anyway).
Using : for i in * ; do cd $i ; for f in examples/*/*.cpp ; do ( head -1 $f | grep file | grep -v '\.cpp' ) && echo $f && perl -pi.bak -e 's/\.C$/.cpp/' $f ; done ; cd .. ; done