still getting the same error message, the steps you suggest take are:
Right click on the file>open with Excel 2007>then click save as CSV Ms-Dos and then upload.
When i open it up in Excel i don't get any wizard it just opens but i have also tried opening excel 2007>clicking open>select the file>click finish on Wizard.
Just to make sure that it's not the powershell at all can you email me or upload your sample file once it is a CSV? i can't see why this would fix it but at least we can rule the powershell out.
mail is richard.wild@live.com