DOS dir /B: want to store evaluated output

[Vertebraille]

Hi,
I've got to write a batch file at work which renames a file (slx_callhistory*.txt) to slx_callhistory.txt, calls an external app, then renames slx_callhistory back to what it was originally

the problem i'm having is, i'm doing a

dir slx_callhistory*.txt /B, and trying to set this output in a variable,
but I don't want the variable to contain the dir call, i want it to contain the output

is there any way of doing this, or can somebody suggest a better way to go about the problem?
Thanks

[Vertebraille]

solved!
used FOR /F %%a IN ('dir slx_opportunity*.txt /B') DO (SET thefilename=%%a).

[DosItHelp]

Or simply:
FOR %%a IN (slx_opportunity*.txt) DO SET thefilename=%%a