The proposal awarded with the La Palma Observatory International Time in 1998 was devoted to the study the formation and properties of planetary systems. The EXPORT group carried out the scheduled observations and is beginning to obtain scientific returns. The spectral range of the ISO spectrographs (specially SWS) covers many interesting features, expected to be present on the Vega and pre-main sequence EXPORT targes. Thus, by mean of the ISO post mission archive, we are carrying a study of the SWS spectra available for the EXPORT targets. Although full interactive reduction is still ongoing, we present our first results, partially mixed with pipeline products. The 10 micron silicates feature (in emission) allows us to probe the circumstella environment of the star, and comparison with typical astronomical silicates, as well as those present in solar comets, is very valuable to characterize the dust content, that eventually will be incorporated into cometesimals.