#define appFileCreator         'cf20'

typedef struct {
         UInt16          volRefNum;
         Char            path[256];
} OpenFile;

{
     OpenFile * launchInfo;
     Err error = errNone;
     DmSearchStateType searchState;
     UInt16 appCard;
     LocalID appID;

     // find the JPGview application
     error = DmGetNextDatabaseByTypeCreator(true, &searchState,
                                     sysFileTApplication, appFileCreator, true,
                                     &appCard, &appID);
     if (errNone != error) return;

     // launch the application with the selected database
     launchInfo = (OpenFile *)MemPtrNew(sizeof(OpenFile));
     if (NULL == launchInfo) return;

     MemPtrSetOwner((MemPtr)launchInfo, 0);  // SysUIAppSwitch will dispose
     launchInfo->volRefNum = 1;
     StrCopy(launchInfo->path, "/PALM/Images/IMG.JPG");

     error = SysUIAppSwitch(appCard, appID, sysAppLaunchCmdCustomBase,
                     launchInfo);
     if (errNone != error) return;
}