IS setup version detecting (5.5, 6.x)

Hi to all,
how is the safest way to discovery (inside of a project script) IS version used to build another setup.
Now I check setup.ins/setup.inx presence:

...browsing filesystem (CDROM, Hard disk, ...)
svSetupDir = setup directory

Code Sample

svSetupPath = svSetupDir ^ "setup.inx";
if (Is(FILE_EXISTS, svSetupPath)) then // IS6.x setup
bisIS6x = TRUE;
bisIS55 = FALSE;
#ifdef DEBUG_LEVEL_1
SprintfBox(INFORMATION, "Setup type", "We have detected a IS6.x setup");
#endif
else
svSetupPath = svSetupDir ^ "setup.ins";
if (Is(FILE_EXISTS, svSetupPath)) then // IS5.5 setup
bisIS6x = FALSE;
bisIS55 = TRUE;
#ifdef DEBUG_LEVEL_1
SprintfBox(INFORMATION, "Setup type", "We have detected a IS5.5 setup");
#endif
else // Unable to detect IS setup version
bResult = FALSE;
#ifdef DEBUG_LEVEL_1
SprintfBox(INFORMATION, "Setup type", "Unable to detect IS setup version");
#endif
endif;
endif;

Is this a good way?
Are there others?

Thanks.
Ciao, Giuseppe

gronchi

Stefan Krueger