diff --git a/bin/tools/createMingwRuntime b/bin/tools/createMingwRuntime
new file mode 100755
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+++ b/bin/tools/createMingwRuntime
@@ -0,0 +1,445 @@
+#!/bin/bash
+#------------------------------------------------------------------------------
+# ========= |
+# \\ / F ield | OpenFOAM: The Open Source CFD Toolbox
+# \\ / O peration |
+# \\ / A nd | www.openfoam.com
+# \\/ M anipulation |
+#------------------------------------------------------------------------------
+# Copyright (C) 2020 OpenCFD Ltd.
+#------------------------------------------------------------------------------
+# License
+# This file is part of OpenFOAM, distributed under GPL-3.0-or-later.
+#
+# Script
+# createMingwRuntime
+#
+# Description
+# Script to copy/create mingw run-time installation from the Linux
+# cross-compilation. Packs everything into a tar or a zip file.
+#
+# To accommodate Windows, all .dll files are also placed in the
+# platforms bin/ directory where they are easily found via the PATH.
+#
+# Futhermore, ThirdParty dll files (including those from mingw itself)
+# are also placed in the same directory.
+#
+# Steps
+# - bundles common files and directories (bin, etc, META-INFO, ...)
+#
+# - copies .exe files from FOAM_APPBIN and .dll files from FOAM_LIBBIN
+# to the new target platforms/win64MingwDPInt32Opt/bin.
+#
+# - copies mingw sys-root .dll files to the new target
+# platforms/win64MingwDPInt32Opt/bin
+#
+# - copies other ThirdParty dll files (scotch, fftw, etc) to
+# platforms/win64MingwDPInt32Opt/bin
+#
+# - copies tutorials (can be deactivated)
+#
+# Note
+# Can only be called when the linux64Mingw environment is active.
+#
+# Slightly ad hoc, potentially incomplete.
+#
+#------------------------------------------------------------------------------
+printHelp() {
+ cat<<USAGE
+
+usage: ${0##*/} [OPTION]
+options:
+ -name=NAME Stem for tar-file (default: auto)
+ -output=DIR Output directory (default: ".")
+ -prefix=NAME Prefix directory within tar-file (default: auto)
+ -no-tutorials Exclude tutorials
+ -no-patch Ignore '_patch' number for output tar-file
+ -no-prefix Do not prefix subdirectory
+ -no-compress Disable compression
+ -compress=TYPE Use specified compression type
+ -sep=SEP Change version/patch separator from '_' to SEP
+ -with-api=NUM Specify alternative api value for packaging
+ -with-testbin Include any Test-* files from user appbin (expert option)
+ -tgz, -xz, -zip Alias for -compress=tgz, -compress=xz, -compress=zip
+ -help Print help
+
+Pack OpenFOAM cross-compiled linux64Mingw -> win64Mingw (run-time)
+
+USAGE
+ exit 0 # Clean exit
+}
+
+# Report error and exit
+die()
+{
+ exec 1>&2
+ echo
+ echo "Error encountered:"
+ while [ "$#" -ge 1 ]; do echo " $1"; shift; done
+ echo
+ echo "See '${0##*/} -help' for usage"
+ echo
+ exit 1
+}
+
+#-------------------------------------------------------------------------------
+outputDir="."
+versionSeparator='_'
+withPatchNum=true
+unset compress packageApi withLibs withTutorials prefixDir tarName
+unset withTestBin
+
+# Cleanup tarName to remove trailing '.tar', detect compression etc
+cleanTarName() {
+ case "$tarName" in
+ (*.tar)
+ tarName="${tarName%.tar}"
+ ;;
+ (*.tar.*)
+ compress="${tarName#*.tar.}"
+ tarName="${tarName%.tar*}"
+ ;;
+ (*.tgz)
+ compress="tgz"
+ tarName="${tarName%.tgz}"
+ ;;
+ esac
+}
+
+while [ "$#" -gt 0 ]
+do
+ case "$1" in
+ -h | -help*)
+ printHelp
+ ;;
+ -name=*)
+ tarName="${1#*=}"
+ cleanTarName
+ ;;
+ -output=*)
+ outputDir="${1#*=}"
+ ;;
+ -prefix=*)
+ prefixDir="${1#*=}"
+ prefixDir="${prefixDir%/}"
+ ;;
+ -no-tutor*)
+ withTutorials=false
+ ;;
+ -no-patch)
+ withPatchNum=false
+ ;;
+ -no-prefix)
+ prefixDir=false
+ ;;
+ -no-compress)
+ unset compress
+ ;;
+ -compress=*)
+ compress="${1#*=}"
+ ;;
+ -sep=*)
+ versionSeparator="${1#*=}"
+ ;;
+ -with-api=*)
+ packageApi="${1#*=}"
+ ;;
+ -with-testbin*)
+ withTestBin=true
+ ;;
+ -tgz | -xz | -zip)
+ compress="${1#*-}"
+ ;;
+ --)
+ shift
+ break
+ ;;
+ -*)
+ die "unknown option: '$1'"
+ ;;
+ *)
+ break
+ ;;
+ esac
+ shift
+done
+
+# Failsafe version separator
+: "${versionSeparator:=_}"
+
+# Verify some basic values
+buildPlatform="$WM_ARCH$WM_COMPILER"
+compOptions="${WM_OPTIONS#$buildPlatform}"
+
+targetPlatform="win64$WM_COMPILER" # <- x86_64-w64-mingw32
+expectedBuildPlatform="linux64Mingw"
+
+if [ "$buildPlatform" != "$expectedBuildPlatform" ]
+then
+ die "Requires <$expectedBuildPlatform> environment: found <$buildPlatform>"
+fi
+
+#-------------------------------------------------------------------------------
+# Resolve the output directory
+outputDir="$(cd "$outputDir" 2>/dev/null && pwd -L)" || \
+ die "Cannot resolve output directory"
+
+[ -w "$outputDir" ] || \
+ die "Output directory non-writable: $outputDir"
+
+#-------------------------------------------------------------------------------
+# Determine the API and PATCH numbers.
+# Extract from META-INFO/api-info
+
+api="$($WM_PROJECT_DIR/bin/foamEtcFile -show-api)"
+patch="$($WM_PROJECT_DIR/bin/foamEtcFile -show-patch)"
+
+echo "Detected api, patch as '$api', '$patch'" 1>&2
+if [ -n "$packageApi" ]
+then
+ echo "Specified package api=$packageApi" 1>&2
+else
+ packageApi="$api"
+fi
+
+
+# Define the output names
+
+if [ -z "$prefixDir" ]
+then
+ prefixDir="OpenFOAM-v${packageApi}"
+elif [ "$prefixDir" = false ]
+then
+ unset prefixDir
+fi
+
+if [ -z "$tarName" ]
+then
+ tarName="OpenFOAM-v${packageApi}"
+ if [ "$withPatchNum" = false ]
+ then
+ echo "Ignoring patch number for output name" 1>&2
+ elif [ "${patch:-0}" -gt 0 ]
+ then
+ tarName="${tarName}${versionSeparator}${patch}"
+ fi
+
+ tarName="${tarName}-win64"
+fi
+
+echo 1>&2
+echo "Tar-file name: $tarName.tar" 1>&2
+echo "Directory name: $prefixDir${prefixDir:+/}" 1>&2
+echo "Output directory: $outputDir" 1>&2
+echo 1>&2
+
+# ---------------------------------------------------------------------------
+
+# Create
+cd "$WM_PROJECT_DIR" || exit
+
+tmpDir="$(mktemp -d openfoam-mingw-runtime.XXXXXXXX --tmpdir)"
+tmpTarget="$tmpDir${prefixDir:+/}${prefixDir}"
+
+trap 'echo "remove $tmpDir"; rm -f $tmpDir 2>/dev/null; exit' EXIT TERM INT
+echo "Using tmp directory: $tmpDir"
+
+# Proper umask
+umask 022
+
+# Runtime directories
+mkdir -p "$tmpTarget/platforms/$targetPlatform$compOptions"
+
+# No separate ThirdParty
+echo "Third-party libraries in platforms/$targetPlatform$compOptions" >| "$tmpTarget/ThirdParty"
+
+echo "Copy common files" 1>&2
+rsync -a --exclude .gitignore COPYING META-INFO README.md bin etc "$tmpTarget"
+
+if [ -n "$FOAM_CONFIG_ETC" ]
+then
+ etcDir="${FOAM_CONFIG_ETC##*/}"
+ if [ "$WM_PROJECT_DIR/$etcDir" = "$FOAM_CONFIG_ETC" ]
+ then
+ echo "Copy additional config dir: $etcDir" 1>&2
+ rsync -a "$etcDir" "$tmpTarget"
+ else
+ echo "Do not know how to copy additional config dir: $FOAM_CONFIG_ETC" 1>&2
+ fi
+else
+ echo "No additional config dir" 1>&2
+fi
+
+
+root="platforms/$buildPlatform$compOptions"
+binDir="$tmpTarget/platforms/$targetPlatform$compOptions/bin"
+libDir="$tmpTarget/platforms/$targetPlatform$compOptions/lib"
+
+userBinDir="$tmpTarget/platforms/$targetPlatform$compOptions/user-bin"
+
+# Definitely need this directory
+mkdir -p "$binDir"
+
+# Mingw installation libs
+other=/usr/x86_64-w64-mingw32/sys-root/mingw
+if [ -d "$other" ] && [ -d "$other"/bin ]
+then
+ echo "Copy mingw sys-root .dll files -> platforms bin/" 1>&2
+ rsync -a "$other"/bin/*.dll "$binDir"
+else
+ echo "Missing mingw .dll files? This looks strange..." 1>&2
+fi
+
+echo "Copy .exe files and .dll files -> platforms bin/" 1>&2
+rsync -a "$root"/bin/*.exe "$root"/lib/*.dll "$binDir"
+
+# Pstream .dll into bin directory
+other="$root/lib/$FOAM_MPI"
+if [ -d "$other" ] && [ -n "$FOAM_MPI" ]
+then
+ echo "Copy ($FOAM_MPI) libPstream.dll -> platforms bin/" 1>&2
+ rsync -a "$other"/*.dll "$binDir"
+fi
+
+# Various dummy (stub) libraries
+other="$root/lib/dummy"
+if [ -d "$other" ]
+then
+ echo "Copy (dummy) *.dll -> platforms bin/" 1>&2
+ for fullpath in "$other"/*.dll
+ do
+ name="${fullpath##*/}"
+ if [ -f "$fullpath" ]
+ then
+ if [ -f "$binDir/$name" ]
+ then
+ echo " [skip dummy/$name]" 1>&2
+ else
+ echo " dummy/$name" 1>&2
+ cp -p "$fullpath" "$binDir"
+ fi
+ fi
+ done
+fi
+
+# Miscellaneous ThirdParty items
+other="$FOAM_EXT_LIBBIN"
+if [ -d "$other" ]
+then
+ echo "Copy FOAM_EXT_LIBBIN .dll files -> platforms bin/" 1>&2
+ rsync -a "$other"/*.dll "$binDir"
+fi
+
+other="$FFTW_ARCH_PATH"
+if [ -d "$other" ] && [ -d "$other"/bin ]
+then
+ echo "Copy FFTW_ARCH_PATH .dll files -> platforms bin/" 1>&2
+ rsync -a "$other"/bin/*.dll "$binDir"
+fi
+
+
+# Other (non .dll) files into lib
+if [ "$withLibs" = true ]
+then
+ echo "Copy non-dll library files -> platforms lib/" 1>&2
+ echo "... currently unsupported" 1>&2
+ # mkdir -p "$libDir"
+ # rsync -a \
+ # --exclude='*.dll' --exclude='*.o' \
+ # "$root"/lib/ \
+ # "$libDir"
+else
+ :
+ # echo "Skip non-dll library files -> platforms lib/" 1>&2
+fi
+
+
+# Any Test-* files from FOAM_USER_APPBIN
+if [ "$withTestBin" = true ]
+then
+ if [ "$(find "$FOAM_USER_APPBIN" -name 'Test-*.exe' | wc -l)" -ge 1 ]
+ then
+ echo "Copy Test-*.exe files from user appbin -> platforms user-bin/"
+ mkdir -p "$userBinDir"
+ rsync -a "$FOAM_USER_APPBIN"/Test-*.exe "$userBinDir"
+ else
+ echo "No Test-*.exe files in user appbin"
+ fi
+fi
+
+
+# Add in tutorials
+if [ "$withTutorials" != false ]
+then
+ if [ -d ".git" ]
+ then
+ echo "Copy tutorials from git..." 1>&2
+ git archive --format=tar HEAD tutorials | (cd "$tmpTarget" && tar -xf -)
+ else
+ echo "Copying the tutorials directory" 1>&2
+ rsync -a tutorials "$tmpTarget"
+ fi
+else
+ echo "Skip tutorials" 1>&2
+fi
+
+echo ===============
+echo "Done copying. Now create archive"
+
+
+# Compression
+archiveCommand="tar -cf"
+archiveSuffix=".tar"
+
+case "$compress" in
+ ('' | no | none)
+ echo "No compression requested" 1>&2
+ ;;
+
+ (gz | gzip)
+ echo "Use gzip compression" 1>&2
+ archiveCommand="tar -czf"
+ archiveSuffix=".tar.gz"
+ ;;
+
+ (tgz)
+ echo "Use gzip compression with tgz ending" 1>&2
+ archiveCommand="tar -czf"
+ archiveSuffix=".tgz"
+ ;;
+
+ (bz | bz2 | bzip | bzip2)
+ echo "Use bzip2 compression" 1>&2
+ archiveCommand="tar -cjf"
+ archiveSuffix=".tar.bz2"
+ ;;
+
+ (xz)
+ echo "Use xz compression" 1>&2
+ archiveCommand="tar -cJf"
+ archiveSuffix=".tar.xz"
+ ;;
+
+ (zip)
+ echo "Use zip archive" 1>&2
+ archiveCommand="zip -r"
+ archiveSuffix=".zip"
+ ;;
+
+ (*)
+ echo "Unknown compression scheme: $compress" 1>&2
+ ;;
+esac
+
+(
+ cd "$tmpDir" || exit
+ time $archiveCommand "$outputDir/$tarName$archiveSuffix" "${prefixDir:-.}"
+)
+
+echo
+echo "# End of creating archive"
+echo " $outputDir/$tarName$archiveSuffix"
+echo
+
+
+# ---------------------------------------------------------------------------