#!/bin/bash -a

exec_bg () {
    exec $1 "$2" &
    exit 0
    }

File="$1"
[[ $File =~ (file|http|https|ftp|sftp)"://"* ]] && exec w3m "$File"

Ext=${File##*.}
[[ $Ext == htm* ]] && exec w3m "$File"
[[ $Ext =~ (sc|tab|csv) ]] && exec sc-im "$File"
[[ $Ext == pdf ]] && exec_bg evince "$File"

exec_bg gvim "$File"