On this CD there are various sample formats. On the Amiga, you normally use the IFF files. If you do own a Mac, then you should use the AIFF files. For OS/2 and Windows computers you should use either VOC or WAVE, depending on your application. Last, but not least there is the AU format which is used on UNIX machines.
All samples are available in all five formats. So you don't have to convert between the formats. There are conversion tools on the CD, though, in case you want to convert other samples (you can use either AmiSox or OctaMED V6).