As with most of the pre-installed waste of space apps, I don't think you can remove it completely, but if it's causing probems, there are a few things you can try -
- update or reinstall it.
-uninstall updates.
-force stop.
-disable.
I actually think file commander is one of the only decent pre-installed apps as it allows you to delete or move some files without having to connect to a laptop or computer.
