The correct extension for modern Excel for macro-enabled workbooks is .xlsm. I was able to open the .xls file and save it as .xlsm, but I don't think it'd be appropriate for me to attach it here. If there are ever any updates posted on the
original thread at HTS, the version posted here can't be updated to follow. I have no intention of forking the project of someone more knowledgeable than I. It'd be more appropriate for you to ask in that HTS thread I think.
But otherwise, welcome to Audioholics Rob!