Let's say someone is saying to somebody:
"Open the folder C:\Documents"
Do we need 'the'-article here?
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In general use you would need the the ("Open the book Gone with the Wind"; "Watch the film Gone with the Wind"; "Play the overture The Hebrides").
But in the computer world it is common to refer to objects with their classifier or type as a sort of extended name. So "Open the folder C:\Documents" is fine (and conforms with ordinary use) but "Open folder C:\Documents" is also in common use, treating "folder C:\Documents" as a sort of name.