Resend accepts all file attachment types except for those in the following list.

.adp.app.asp.bas.bat
.cer.chm.cmd.com.cpl
.crt.csh.der.exe.fxp
.gadget.hlp.hta.inf.ins
.isp.its.js.jse.ksh
.lib.lnk.mad.maf.mag
.mam.maq.mar.mas.mat
.mau.mav.maw.mda.mdb
.mde.mdt.mdw.mdz.msc
.msh.msh1.msh2.mshxml.msh1xml
.msh2xml.msi.msp.mst.ops
.pcd.pif.plg.prf.prg
.reg.scf.scr.sct.shb
.shs.sys.ps1.ps1xml.ps2
.ps2xml.psc1.psc2.tmp.url
.vb.vbe.vbs.vps.vsmacros
.vss.vst.vsw.vxd.ws
.wsc.wsf.wsh.xnk