>>Thanks. My files were very big and it shows 'No difference'. I am not sure I can trust 100% to this.
>>
>>In any case, this is very helpful.
>
>I am not sure if this is the one I used last time. Google always recommends a lot in the top search result. So far, I have tried a few and never had a problem. But, if sensitive information applies, I would definitely not go online.

Good point but a bit too late. I hope nothing too sensitive was in that prg....