In windows XP, you can
increase the list of recently used documents in start menu. By default
windows XP display the shortcuts of last fifteen programs on recent
documents list in start menu but you can increase this value with your
required input value. However this tip is very
useful for all new computer users because they can easily access their
required documents from last visited documents history. This trick will
work in nearly all of the windows versions like windows 2000, XP and
2003.
Follow the given steps for configuration to increase the list of
recently opened documents:
To edit the computer registry, first you should log onto your
computer with administrative rights.
Click Start button and type regedit in Run
option then press Enter for next.

Go to
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Policies
Now in left
side panel, click right to create a new Key value with the name
Explorer
under "Policies" area.

Now explore the full path like:
Go to
[HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer

Now in
right side panel, click right to create a new DWORD value with
the name MaxRecentDocs and then set values
with your required
input value.

In this case, we are trying to set input value to 30 and press Ok
button.

But next time, if you want to disable this functionality then
simply change the value of data box to 15 or delete the
MaxRecentDocs DWORD item.
Now
close the registry editor and restart your computer after any changes to
go into effect.