The script below should fix these. (Obs search and replace the path)
#!/bin/sh
find /relative/path/to/opensg -name "README" -print | xargs chmod -x
find /relative/path/to/opensg -name "SConscript" -print | xargs chmod -x
find /relative/path/to/opensg -name "Makefile" -print | xargs chmod -x
find /relative/path/to/opensg -name "*.h" -print | xargs chmod -x
find /relative/path/to/opensg -name "*.html" -print | xargs chmod -x
find /relative/path/to/opensg -name "*.inf" -print | xargs chmod -x
find /relative/path/to/opensg -name "*.inl" -print | xargs chmod -x
find /relative/path/to/opensg -name "*.rc" -print | xargs chmod -x
find /relative/path/to/opensg -name "*.res" -print | xargs chmod -x
find /relative/path/to/opensg -name "*.fcd" -print | xargs chmod -x
find /relative/path/to/opensg -name "*.cpp" -print | xargs chmod -x
find /relative/path/to/opensg -name "*.sln" -print | xargs chmod -x
find /relative/path/to/opensg -name "*.manifest" -print | xargs chmod -x
find /relative/path/to/opensg -name "*.rc2" -print | xargs chmod -x
find /relative/path/to/opensg -name "*.ico" -print | xargs chmod -x
find /relative/path/to/opensg -name "*.bmp" -print | xargs chmod -x
find /relative/path/to/opensg -name "*.png" -print | xargs chmod -x