The reports downloaded from TA100DIY are in .XML format and you can view them via Internet browser (IE, Mozila Firefox etc). However you can also convert XML reports into XLS (Microsoft® Excel) format to perform some extra calculations by using the information from the reports. You must have

1 – Microsoft® Excel (from Microsoft® Office XP or above)
2 – A freeware called XMLtoXLS.xla.exe

Click Here to start download the tool and the instruction to use