Here is the list of file association fixes (Windows defaults) for some of the common file types. These fixes are applicable for Windows® 10 only.
Note: .REG files have plain-text content, viewable using a text editor like Notepad, just in case you want to see the contents before applying.
1. Download the corresponding fix from the above table. (Use Right-click – Save as option in your browser to download the fixes.)
2. Unzip the file and extract the .REG file to Desktop.
3. Right-click the REG file and choose Merge. Alternately, you can open the Registry Editor and then using the Import option from the File menu, to merge the REG file contents.
Note that you need to be an administrator to apply these fixes.