That is what I have: Builds - Chart Maker.xojo_binary_project
. If I add an endig character or remove the last one (t), the icon change to the default OS folder.
Some old Builds folder also have this file name schema (I have one dated of: January 27, 2018)
Nota: I do not know if this is related, but I had troubles with JDownloader (2): slow download speed and the speed appears in red. I trashed some files, the speed comes back, the speed value is back to black.
JDownloader is a download manager: you give it an url (to file or folder) and it download it for you (if it can).