Parallels desktop not found

Remote Desktop Connection is a Windows app to allow users to access a Windows computer from a remote location. This must have been installed on that old Mac. Did it migrate over when you used the Migration Assistant?

Regardless, I am guessing that this application, or one of its files, is still associated with Parallels Desktop.

Try the following:

1. Left-click or <control>-click on the affected application or file.
2. A submenu should appear. Select on "Get info".
3. Look at the "Open with" to see what application is it set to. Is it set to "Parallels"?

Right Click on the file & chose... Open with & which App you want to open it with.

Or... drag that files icon & drop it on the icon of the App you want to open it with.

Or... Do a Get Info on an mpg4 file. CMD+i keys, then 2/3rds the way down look forOpen With..., select the App & click on the Change All button.

If still need be…

Open Terminal and run each of these one at a time

/System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/LaunchServices.framework/Versions/A/Support/lsregister -kill -r -domain local -domain system -domain user

sudo /System/Library/Frameworks/CoreServices.framework/Frameworks/LaunchServices.framework/Support/lsregister -kill -seed -lint -r -f -v -dump -domain local -domain system -domain user -domain network

killall Dock

sudo mdutil -E /

sudo mdutil -i on /

Rebuilding a drive index can take a long time, so be prepared to wait whether you do it through the System Preference panel or the command line.