Uploading spreadsheet files

Tried to upload a small spreadsheet for the current DQ Tau collaboration with JWST but .xls is not one of the permitted file types. Having written upload scripts I know this is a security issue because some file types can contain and run potentially harmful macros. I think we can safely assume that no AAVSO member will want to scupper their own website though…
I get a box saying create a post voting topic. I dont want to do this, I just want to make a topic pure and simple. Anyway, here goes.