File Size limit in Consolidate & Glue?

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Strange problem is cropping up for the first time. Using Reaper v5.20pre14/x64 but earlier versions (in the 5.20pre series) do the same thing.

Any attempt to glue or consolidate a series of items into to one, where the total size would exceed 1.98 GB results in a single item of 1.98 GB, and then a second item with the remainder. No amount of cajoling or intimidation will create a single item over 1.98 GB.

In project settings I have the file size before starting a new file set to 0. Also tried 4096 MB since that's double my requirements and it made no difference. I can't find any other reference or setting for this apparent limitation.

The file format is set to WAV 32bitFP at 176k.

The system is Windows 10 Pro 64-bit. Four hard drives (a 2tb, 1 3tb and 2 4tb) are present on the system, all with GPT partition. Reaper has a dedicated drive, the 2T one, and it has 1 T available. So I don't think there is an OS issue involved.

Anyone with an idea of what's happening here, and what to do about it?