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diff --git a/extra/7z2lzma/7z2lzma.bash b/extra/7z2lzma/7z2lzma.bash
new file mode 100755
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+++ b/extra/7z2lzma/7z2lzma.bash
@@ -0,0 +1,114 @@
+#!/bin/bash
+#
+#############################################################################
+#
+# 7z2lzma.bash is very primitive .7z to .lzma converter. The input file must
+# have exactly one LZMA compressed stream, which has been created with the
+# default lc, lp, and pb values. The CRC32 in the .7z archive is not checked,
+# and the script may seem to succeed while it actually created a corrupt .lzma
+# file. You should always try uncompressing both the original .7z and the
+# created .lzma and compare that the output is identical.
+#
+# This script requires basic GNU tools and 7z or 7za tool from p7zip.
+#
+# Last modified: 2008-09-27 11:05+0300
+#
+#############################################################################
+#
+# Copyright (C) 2008 Lasse Collin <lasse.collin@tukaani.org>
+#
+# Permission is hereby granted, free of charge, to any person obtaining
+# a copy of this software and associated documentation files (the
+# "Software"), to deal in the Software without restriction, including
+# without limitation the rights to use, copy, modify, merge, publish,
+# distribute, sublicense, and/or sell copies of the Software, and to
+# permit persons to whom the Software is furnished to do so, subject to
+# the following conditions:
+#
+# The above copyright notice and this permission notice shall be
+# included in all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+# IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+# CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+# TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+# SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+#
+#############################################################################
+
+# You can use 7z or 7za, both will work.
+SEVENZIP=7za
+
+if [ $# != 2 -o -z "$1" -o -z "$2" ]; then
+	echo "Usage: $0 input.7z output.lzma"
+	exit 1
+fi
+
+# Converts an integer variable to little endian binary integer.
+int2bin()
+{
+	local LEN=$1
+	local NUM=$2
+	local HEX=(0 1 2 3 4 5 6 7 8 9 A B C D E F)
+	local I
+	for ((I=0; I < "$LEN"; ++I)); do
+		printf "\\x${HEX[(NUM >> 4) & 0x0F]}${HEX[NUM & 0x0F]}"
+		NUM=$((NUM >> 8))
+	done
+}
+
+# Make sure we get possible errors from pipes.
+set -o pipefail
+
+# Get information about the input file. At least older 7z and 7za versions
+# may return with zero exit status even when an error occurred, so check
+# if the output has any lines beginning with "Error".
+INFO=$("$SEVENZIP" l -slt "$1")
+if [ $? != 0 ] || printf '%s\n' "$INFO" | grep -q ^Error; then
+	printf '%s\n' "$INFO"
+	exit 1
+fi
+
+# Check if the input file has more than one compressed block.
+if printf '%s\n' "$INFO" | grep -q '^Block = 1'; then
+	echo "Cannot convert, because the input file has more than"
+	echo "one compressed block."
+	exit 1
+fi
+
+# Get copmressed, uncompressed, and dictionary size.
+CSIZE=$(printf '%s\n' "$INFO" | sed -rn 's|^Packed Size = ([0-9]+$)|\1|p')
+USIZE=$(printf '%s\n' "$INFO" | sed -rn 's|^Size = ([0-9]+$)|\1|p')
+DICT=$(printf '%s\n' "$INFO" | sed -rn 's|^Method = LZMA:([0-9]+)$|\1|p')
+
+if [ -z "$CSIZE" -o -z "$USIZE" -o -z "$DICT" ]; then
+	echo "Parsing output of $SEVENZIP failed. Maybe the file uses some"
+	echo "other compression method than plain LZMA."
+	exit 1
+fi
+
+# The following assumes that the default lc, lp, and pb settings were used.
+# Otherwise the output will be corrupt.
+printf '\x5D' > "$2"
+
+# Dictionary size
+int2bin 4 "$((1 << DICT))" >> "$2"
+
+# Uncompressed size
+int2bin 8 "$USIZE" >> "$2"
+
+# Copy the actual compressed data. Using multiple dd commands to avoid
+# copying large amount of data with one-byte block size, which would be
+# annoyingly slow.
+BS=8192
+BIGSIZE=$((CSIZE / BS))
+CSIZE=$((CSIZE % BS))
+{
+	dd of=/dev/null bs=32 count=1 \
+		&& dd bs="$BS" count="$BIGSIZE" \
+		&& dd bs=1 count="$CSIZE"
+} < "$1" >> "$2"
+
+exit $?