How do we get rid of them?

 Files starting with ._ in Mac and Linux are hidden automatically.

 But Windows doesn't handle period-prefixed files this way.  So the recommendation (rather than deleting these files) would be to make them hidden in Windows as well.

The below information has been copied from LIFEWIRE. Since I do not have a windows system, I am using them to help show you how to hide your files.

How to Show or Hide Hidden Files and Folders in Windows

It's not difficult to show or hide hidden files and folders in Windows. To accomplish either, see below:

1. Open Control Panel.​ One quick way to do this in newer versions of Windows is to search for it from the taskbar.

2. Select the Appearance and Personalization link.​ 

3. Select File Explorer Options (Windows 11/10) or Folder Options (Windows 8/7).

4. Select the View tab.

5. In the Advanced settings section, locate the Hidden files and folders category.​ 

You should be able to see it at the bottom without scrolling. There are two options within it.

6. Choose what you want to do:

    • Don't show hidden files, folders, or drives will hide the files, folders, and drives that have the hidden attribute toggled on.​ 
    • Show hidden files, folders, and drives lets you see the hidden data.
  1. Select OK at the bottom.

7. You can test to see if hidden files are actually being hidden by browsing to the C:\ drive. If you do not see a folder named ProgramData, then hidden files and folders are being hidden from view.

Copied directly from the website LIVEWIRE. 

 Use a third party app to hide the files.

  Unfortunately there is no way of preventing the resource fork from being saved as a secondary file.  However, if too many of them are being created then users can use third-party utilities to locate and remove the files. BlueHarvest is a popular and cheap program that can manage hidden files created by OS X.

 Save the file in an updated format. 

 Since resource forks are a legacy way of storing file information, users can try updating the file format to a more modern one.  Users would have to open the document in a program that can properly read it, and then re-save it.  For instance, if an old ".doc" Word document has a resource fork, loading it into the latest version of Word and saving it in the new ".docx" format should remove the resource fork.