Well, it took me a while to figure it out
Instead of having two separate resources, one for the xlsx version and an other for the ods flavor, along with all of the bagage that comes with that dumb move on my part, I zip'ed both into a single file.
So we are back to a single resource for the OXcalculator. The file is a bit heavier on the wire, but we are not talking huge.
Hopefully everyone has what is needed to unzip the bundle. The file not needed can just be zap'ed at receiver end. Does this work for you ?
OXcalculator - Bill of Material and Cost calculator v1b006 (xls + ods)
OXcalculator - Your computer figures out the parts you need to build your OX by giving it X, Y & Z