Convert UNIX timestamps to XL and remove squares from a string of data in a column

Hello Experts!

I have an excel 2003 workbook with a column of data imported from UNIX that contains UNIX date/timestamps as well annoying 'squares' which represent spaces. Is there a macro or formula that can reformat this data to a more friendly/readable format (mm/dd/yyyy and replace the squares with spaces). Here is an example of what is contained in a single cell in this column (Column K):

1294698665herambh.sharmalaApproved -- as alternate for chamner1294701745tami.fordhanApproved1294755258joe.smithApproved1294755258Application ServiceProcess Approved

Any help would be greatly appreciated.

S.