Conversion of text files without change in the original file

Hi,

I need to add a leading zero before month in a text file, but the spacing should same as before after adding the zero also.

I tries using to open with excel and changed the format but after i did the test to columns the spacing of the old format is changed.

Ex:

BUARDC 04294008295 010321 6000 7/17/2010 0000354652 000224

This is the sample data, in this i need to add zero before that "7". but the format should be same like the spacing between the letters and all the numbers also.

Can anyone help me on this i can solve this issue.

Thanks in advance

Vinoth