These are general options that affect how Directory Opus copies files.
This template is used to define the new name of a copy of an existing file (for example, when you select a file and press Ctrl+C followed by Ctrl+V). You can use these codes in the template string to insert information:
The original file name is inserted without the file extension (which is automatically applied to the end of the new file).
For example, the default template is %1 - Copy %2. Say you pick a file "Document.txt" and press Ctrl+C, Ctrl+V.
The Include duplicate count of 1 option controls what happens for the first copy of an existing file (i.e. with a "copy count" of 1). By default the copy count isn't shown, so %2 will expand to nothing, and the first copy's name would be Document - Copy.txt. If you turn this option on, the first copy's name would be Document - Copy (1).txt.
If you press Ctrl+V again to make a second copy, the copy count would be 2, and the new filename would be Document - Copy (2).txt.
You can also use the evaluator to generate a new name - see Generated File Names for details.