using a variable in a file name

[Max in montreal]

I am trying to see if certain files exist. These files are called 1.txt, 2.txt, 3.txt...

using this:

If FileExists("sonysonylineup1.txt") Then do something.

How can I replace the 1 in the filename with a variable in the line above?

Thanks in advance for the help!

Max

[NewPlaza]

This will get you started.

Local $var = 1
Do
    If FileExists("\\sony\sony\lineup\" & $var & ".txt") Then do something
    $var = $var + 1
Until 0