Hi Jody, the current format is " [PLACEHOLDER].ext" so always immediately before the extension and in the square brackets. .placeholder will be the new extension, so I can filter on that in future.
As mentioned though I can do the rename elsewhere quite easy. Getting the zero byte files is the hard bit. I can even drag drop them in bulk to a util that replaces the file with zero byte
The reason for creating files in advance gave the ability to see what is missing, using PLACEHOLDER provided a simple, and filterable visual aid to identify those files, which may have been of different length to allow for the expected file size.
I don't expect a zero byte file to reserve drive space. The methodology has changed with falling storage costs and there is now at least 100Gb reserved space on the drive should the missing files, though unlikely, appear.