Converting standard text to hh:mm:ss

Hi
Does enyone know how I can convert standard text 160:00 to time 160:00:00? The output format of reports I'm getting from an other program makes it difficult to work with the numbers in excel.

format cell as custom [h]:mm:ss

I dit that, but it din't change to the format i wanted. Not unless I double click the cell and press enter. But then I'd have to do the same thing in every cell... A lot of work with a very big report.

Thanx, but I need it to change format in the native cell.