there are no exes in linux.
because file endings are for apps and OS that are to stupid to do the right thing.
The nvidia-bug-report.sh ends on sh
And it is part of the installer - if you did install the driver correctly, you should be able to just type nvidia-bug-report.sh as root and everything works.
If you did not install this part successfully do this:
sh NVIDIA-Linux-x86-1.0-8756-pkg0.run --extract-only go into the created dirs, located it, run it.