Although that works, I still cannot open anything that's not an application.
For example, the first and the second statements do not work while the third works.
1. EXECUTE C:\Users\Developer\Downloads\playbook_white1.jpg;
2. EXECUTE C:\Users\Developer\Desktop\Ex_EXECUTE\123.txt;
3. EXECUTE C:\Program Files (x86)\Internet Explorer\iexplore.exe;