#!/bin/bash
#foobar2000.sh

# your installation directory
cd ~/.foobar2000/

if [ "$1" != "" ]; then
i="$@" 
else 
echo "No files"
exit 0
fi

#files
#add extensions if you want
for ext in .aac .mp3 .mp4 .ogg .flac .m4a .wma .mpc .wav .rar .zip; do
files=`echo $i | sed "s/$ext /$ext\" \"z:/g"`
i=$files
done

#folder
files=`echo \"z:$i | sed "s/ \//\" \"z:\//g"`

eval wine foobar2000.exe /add "$files\""

echo "Action: adding Directory or Files \"z:${files}\" to foobar2000"

exit 0

I made a little script to add files/folders in foobar from the Nautilus context menu.

#!/bin/bash
# launches fb2k w/ options

# set path to foobar executable
FB2K="C:\Program Files\foobar2000\foobar2000.exe"
# set Internal Field Separator : character should not appear in filepaths uris or options
IFS='|'

# gives the absolute z: path usable by wine
winepath () {
	case "$1" in
	/*) # absolute path
		file="$1"
		;;
	~*) # unexpanded home-relative (?)
		file="$HOME${1:1}"
		# HOME + ~/path, stripping ~
		;;
	*) # relative path
		file="$(pwd)/$1"
		;;
	esac
	file=`echo "z:$file" | sed  -e '
		s%/[^/]\+/\.\./%/%g	# replaces /somedir/../ by /
		s%\./%%g		# removes ./
		s%/%\\\\%g		# replace / by \
	'`
}

# list of arguments separated by IFS instead of space to prevent string splitting
args=""

# go through all parameters given to script and transform them for wine use if needed
until [ -z "$1" ] ; do
	case "$1" in

	-h|-help)
		echo "Usage : `basename $0` [options] [file1 [file2 [...]]]"
		echo "Available switches: -add, -play, -pause, -playpause, -prev, -next, -rand, -stop, -exit, -show, -hide, -config -command:<menu command>, -playlist_command:<context menu command>, -playing_command:<context menu command>, -help."
		exit
		;;

#		add custom options here. Example :
#		-rescan)
#		args="$args$IFS/command:\"Rescan Media Library\""
#		;;

	-*)	# options, replacing first character
		 args="$args$IFS/${1:1}"
		;;
#	/[^/]+)	args="$args$IFS$1" # alternative version, windows syntax

	*)	# anything else ? could be file path. Or an url... or some other kind of ufo
		if [ -e "$1" ] ; then	# if it's a file or a directory, translate it for wine
			winepath "$1"
			args="$args$IFS$file"
		else			# otherwise keep it as is
			args="$args$IFS$1"
		fi
		;;
	esac
	shift
done

# replace positional parameters with arguments (starts out with a separator)
set ${args:1}

/usr/bin/wine "$FB2K" "$@" &
exit

#!/bin/bash
# launches fb2k w/ options

# set path to foobar executable
FB2K="C:\Program Files\foobar2000\foobar2000.exe"
# set Internal Field Separator : character should not appear in filepaths uris or options
IFS='|'


# list of arguments separated by IFS instead of space to prevent string splitting
args=""

# go through all parameters given to script and transform them for wine use if needed
until [ -z "$1" ] ; do
    case "$1" in

        -h|-help)
            echo "Usage : `basename $0` [options] [file1 [file2 [...]]]"
            echo "Available switches: -add, -play, -pause, -playpause, -prev, -next, -rand, -stop, -exit, -show, -hide, -config -command:<menu command>, -playlist_command:<context menu command>, -playing_command:<context menu command>, -help."
            exit
        ;;

#       add custom options here. Example :
#       -rescan)
#           args="$args$IFS/command:\"Rescan Media Library\""
#       ;;

        -*) # options, replacing first character
            args="$args$IFS/${1:1}"
        ;;
#       /[^/]+) args="$args$IFS$1" # alternative version, windows syntax

        *) # anything else ? could be file path. Or an url... or some other kind of ufo
            if [ -e "$1" ] ; then # if it's a file or a directory, translate it for wine
                args="$args$IFS`winepath -w "$1"`"
            else # otherwise keep it as is
                args="$args$IFS$1"
            fi
        ;;
    esac
    shift
done

# replace positional parameters with arguments (starts out with a separator)
set ${args:1}

/usr/bin/wine "$FB2K" "$@" &
exit

can easily change tracks while in other programs.

sudo apt-get install xbindkeys xbindkeys-config
xbindkeys --default > ~/.xbindkeysrc
xbindkeys-config