Accessing iCloud Drive files via AppleScript

I am trying to get AppleScript to open a file located at iCloud Drive:Documents:Manuals:BBEdit_13.0.1_User_Manual.pdf.

tell application "Finder"
	open file "/Users/cb/Library/Mobile Documents/com~apple~CloudDocs/Documents/Manuals/Computer/BBEdit_13.0.1_User_Manual.pdf.icloud"
end tell

I obtained the filepath by right clocking the target file + option key & selecting copy... as filename. Running the script results in error

Finder got an error: Can’t get file \"/Users/cb/Library/Mobile Documents/com~apple~CloudDocs/Documents/Manuals/Computer/BBEdit_13.0.1_User_Manual.pdf\"." number -1728 from file "/Users/cb/Library/Mobile Documents/com~apple~CloudDocs/Documents/Manuals/Computer/BBEdit_13.0.1_User_Manual.pdf"

What am I doing wrong? Does anyone know what AppleScript error -1728 means?