Hi Debbi,

XLSX should be able to handle more than 1 000 000 rows while XLS is limited to 65536 rows maximum.
ROI Statistics export in XLSX format by default, so i don’t understand why it doesn’t work in your case.

Does the problem appears with the ROI Statistics and ROI inclusion analysis plugin or only with the latter ?
In the meantime I will try to replicate the issue.

Best,

– Stephane