Here is a list of extensions that could be excluded from being scanned. Feel free to add your own.
aac,acs,adc,adm,ai,am,art,avi,awe,bat,bin,bkf,bmp,cab,cat,cfg,chm,class,clx,cmd,cnt,cnv,com,config,cpl,cpp,cs,csf,css,cur,cw,dic,dll,dlm,dotx,env,eps,evt,evtx,exe,flt,fon,gif,h,hhk,hiv,hlp,hxs,hxw,hyp,icc,icm,ico,idx,inf,ini,iso,its,jar,jpeg,jpg,js,jse,lex,lib,liveupdate,lnk,lxa,m4a,m4p,m4v,mda,mdf,mid,mof,mov,mp3,mp4,mpeg,mpg,msc,msi,msp,mst,ngr,ocx,ogg,olb,pf,pfb,pfm,pnf,png,ps1,psd,psp,py,pyw,query,rll,rm,rmm,rmx,rp,rpm,rpv,rts,sdb,smi,spd,swp,sys,theme,tif,tiff,toc,ttc,ttf,vb,vbe,vbn,vbs,vhd,vmdk,vsd,wav,wma,wmb,wmdb,wmv,wpc,wsf,wsh,xaml,xdr,xml