Windows XP Mode under Windows 7 should create application automatically during installation save some restriction applications which can be modified in a registry list as described below.
There are two registry keys for the application control:
KEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Virtual Machine\VPCVAppExcludeList
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Virtual Machine\VPCVAppIncludeList
However, if it's simple something that needs to be manually created that answer is available at [SO Manual Shortcut for XP Mode Application](If the Creating an app shortcut in Windows 7 XP Mode) which describes a manual method for creating shortcuts to launch applications in XP Mode on Windows 7.
The Windows XP Mode locations and installation/usage instructions can be found at Install and use Windows XP Mode.