Renaming files with a macro

[exceluser]

hi every1

how can i use a macro that will rename files in a specified folder but if there is no such a file to rename, then nothing will happen?

name "c:\file.xls" as "c:\myfile.xls"

it works

but after it is renamed i would like to not get error message (end bug etc.) when running the macro again

2nd question: is it possible to rename files by using global characters (? or *) ?

i tried with * or ? but it is not working

thanks in advance

 

[exceluser]

any idea?