The ...\Microsoft\Windows\Recent folder is a Microsoft Windows-specific folder, where the Windows OS keeps links to “recently used files”. So if files are being created there, it’s likely a link, and it’s likely because you have the Windows feature for tracking recently-used-files open, and you had recently opened a file called CustomDestinations<alpha_numerics>.temp, whether intentionally or as a side effect.
You can control the MS Windows setting at Start Menu > Settings > Personalization > Start, with the “Show recently opened items …” toggle.
If it’s really Notepad++ that’s “creating” that file, likely one of your plugins is creating a temporary file someplace else (presumably in a temporary folder), and then Windows is creating a shortcut to that file in that ...Windows\Recent folder.