Unless I misunderstand what you're trying to accomplish, it's really
not that difficult.
Create a batch file that you can put in your startup folder.
Within the batch file, call the programs you need to launch pointed to
the specific documents.

For example, let's say the file is startup.bat, and it looks like
this:

start winword.exe "C:\Documents\MyWordDoc.doc"
start excel.exe "C:\Documents\Spreadsheets\MyWorksheet.xls" "C:
\Documents\Spreadsheets\MyOtherSheet.xls"
start msaccess.exe "C:\Databases\MyDB.mdb"