To remove the wrong recommended program from Open With window, follow below steps:
1. Navigate to HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\[file extension]\OpenWithList. For example, if you want to delete the wrong recommended program for test.003, then you should look for file with .003 extension.
2. At the right panel, look for the key with value of the wrong program which has been used to open the file, right click on it and choose delete to remove it. For example, delete the key with AcroRd32.exe.
Once you have done above steps, you will notice the wrong program is disappeared from the recommended program list. Hopefully this trick will help you to save some of your time while struggling to change it in simple steps.