Adobe Files Extensions - What are adobe files and how do I open a adobe file?

What are adobe files and how do I open a adobe file?

File Type Category File Format
.act Adobe Files ADPCM Compressed Audio File
.ava Adobe Files AvaaBook eBook
.cel Adobe Files Affymetrix Probe Results File
.cxt Adobe Files Director Protected Cast File
.ddd Adobe Files GLBasic 3D Data File
.flp Adobe Files FruityLoops Project
.gp5 Adobe Files Guitar Pro 5 Tablature File
.oam Adobe Files Adobe Edge Animate Widget File
.ppcx Adobe Files Adobe Presenter Presentation Audio File
.pset Adobe Files Adobe InDesign Plug-in Set File
.sbx Adobe Files ESRI Spatial Index File
.sesx Adobe Files Adobe Audition Session File
.sf2 Adobe Files SoundFont 2 Sound Bank
.sfk Adobe Files Sound Forge Audio Peak File
.spd Adobe Files SPSS Custom Dialog File
.str Adobe Files dBASE Structure List Object File
.vc3 Adobe Files VSampler Soundbank File
.vce Adobe Files Visual CertExam Exam File
.vdj Adobe Files VirtualDJ Audio Sample File
.x32 Adobe Files Adobe Xtra File
.xfd Adobe Files XFD File