Can't checkout project on Windows due to invalid path

I tried to clone this project on Windows but was unable to because of the invalid file name:

error: invalid path 'test-data/ocfl/oni-manual/test data/x!@#$%^&*()- ?:;{}[]~`'"'

I can see why you might have such a file but perhaps it could be generated by the tests rather than being part of the repo? 

(and yes, I know Windows isn't the best dev environment but still...)