New
#1
They look like the Remote storage icons for Onedrive - There was a change with the FCU, allowing files to be held both locally and remotely, and also just remotely (to save space on smaller devices). The green tick item is still used for files kept in remote and local a cloud icon for those that are only on the Net, and the Icon you display for those that need synchronizing. Other systems may use the same overlays, Google Drive, Dropbox Etc
Use the Onedrive controls to select which files and folders are controlled by the Onedrive system
Sync Any Folder to OneDrive in Windows 10 Apps Features Tutorials
There are lots more In Tutorials here for different aspects of Onedrive
Your were right, I disabled Onedrive and they are gone.
Thanks for help