Solution Method 1:
Uninstall the legacy software. (The most efficient way)
Solution Method 2:
1. First, set Adobe Reader as default program.
2. Export current "running default program" to xml.
Run powershell or command prompt as administrator. Execute command below:
Dism /Online /Export-DefaultAppAssociations:C:\TempAA.xml
3. Open the C:\TempAA.xml with notepad. Copy the contents and paste to new notepad, and name as OEMDefaultAssociations.xml
4. Copy and replace the OEMDefaultAssociations.xml to %systemroot%\system32 (C:\windows\system32). (Do a backup before you replace the original file)
