Create .bat file which will open all files you wanted when you logon

run.bat
start C:\Program Files\Microsoft Office\Office12\excel.exe  file1.xls
start C:\Program Files\Microsoft Office\Office12\excel.exe  file2.xls
....more command

Put .bat file in Startup folder


C:\Users\xxxx\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\ru.bat

REM copy all files from source to destination based on changed file, also it overwrite existing file based on latest update file from source

maint.bat
start xcopy c:\docs d:\cocs  /D /E /Y