Certain word not allowed in Onedrive

I am unable to save certain words in Onedrive, which is a serious pain when jumping between my laptop and my desktop. 

The app is DAZ 3D. I use it for creating and rendering 3D images. When Onedrive was saving files it said I had to rename certain files. Why, the names are harmless?? Please see the attachment.

shrooms 02.dsf

shrooms 03.dsf

Ivory.pz2

ivory.png

ivory.ds