UserAgent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/62.0.3202.62 Safari/537.36

Steps to reproduce the problem:
Run the following in a terminal:

mkdir "folder with spaces"
touch "folder with spaces/index.html"
chromium "folder with spaces/index.html"
chromium folder\ with\ spaces/index.html
touch "file with spaces.html"
chromium "file with spaces.html"
chromium file\ with\ spaces.html

What is the expected behavior?
Chromium successfully opens "folder with spaces/index.html" and "file with spaces.html"

What went wrong?
Chromium opens multiple tabs with URLs like "folder/", "with/", "spaces/index.html", "file/", etc.

Did this work before? N/A 

Chrome version: 62.0.3202.62  Channel: stable
OS Version: ArchLinux
Flash Version: 

This also happens when opening such a file from a GUI file manager like Thunar. I've not tested with others.