U3_DEVICE_SERIAL                    serial number of device (copy protection, e.g. 0000060415134347)
U3_DEVICE_PATH                      drive letter to device (F:)
U3_DEVICE_DOCUMENT_PATH             path to documents (F:\Documents)
U3_DEVICE_VENDOR                    vendor
U3_DEVICE_PRODUCT                   product name string
U3_DEVICE_VENDOR_ID                 vendor id (decimal!! 2284 = 0x08ec)
U3_APP_DATA_PATH                    data path for app (on device: X:\System\Apps\{GUID}\Data)
U3_HOST_EXEC_PATH                   path to exe on host (%AppData%\U3\%U3_DEVICE_SERIAL%\{GUID}\Exec)
U3_DEVICE_EXEC_PATH                 path to needed files on device (X:\System\Apps\{GUID}\Exec)
U3_ENV_VERSION                      should be 1.0
U3_ENV_SUB_VERSION                  ??? (currently 2)
U3_ENV_LANGUAGE                     language id of LaunchPad (1033=English, 1031=German, etc.)
U3_IS_UPGRADE                       can be "false" or "true"
U3_IS_DEVICE_AVAILABLE              "true"/"false"
U3_IS_AUTORUN                       is this an autorun-launch? "true"/"false"
U3_DAPI_CONNECT_STRING              who needs this? (=U3_DEVICE_SERIAL ???)
ALLUSERSPROFILE                     C:\Documents and Settings\All Users
APPDATA                             C:\Doc...\<username>\Application Data
CommonProgramFiles                  C:\Program Files\Common Files
HOMEPATH                            C:\Documents and Settings\<username>
ProgramFiles                        C:\Program Files
SystemRoot                          C:\WINDOWS
USERPROFILE                         C:\Documents and Settings\<username>
TEMP                                C:\DOCUME~1\<username8.3>\LOCALS~1\Temp
windir                              C:\WINDOWS