diff --git a/.gitignore b/.gitignore
index fcd3601616f..cc7fd7bd0b1 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,6 +1,8 @@
 icu4c/bin
+icu4c/bin64
 icu4c/include
 icu4c/lib
+icu4c/lib64
 icu4c/source/Doxyfile
 icu4c/source/Makefile
 icu4c/source/README
@@ -23,6 +25,8 @@ icu4c/source/common/libicu*.*
 icu4c/source/common/release
 icu4c/source/common/svchook.mk
 icu4c/source/common/unicode/platform.h
+icu4c/source/common/x64
+icu4c/source/common/x86
 icu4c/source/config.cache
 icu4c/source/config.log
 icu4c/source/config.status
@@ -55,6 +59,8 @@ icu4c/source/extra/uconv/uconv.1
 icu4c/source/extra/uconv/uconv.plg
 icu4c/source/extra/uconv/uconv.vcproj.*.*.user
 icu4c/source/extra/uconv/uconvmsg
+icu4c/source/extra/uconv/x64
+icu4c/source/extra/uconv/x86
 icu4c/source/i18n/*.ao
 icu4c/source/i18n/*.d
 icu4c/source/i18n/*.o
@@ -67,6 +73,8 @@ icu4c/source/i18n/debug
 icu4c/source/i18n/i18n.res
 icu4c/source/i18n/i18n.vcproj.*.*.user
 icu4c/source/i18n/release
+icu4c/source/i18n/x64
+icu4c/source/i18n/x86
 icu4c/source/icudefs.mk
 icu4c/source/io/*.ao
 icu4c/source/io/*.d
@@ -78,6 +86,8 @@ icu4c/source/io/debug
 icu4c/source/io/io.res
 icu4c/source/io/io.vcproj.*.*.user
 icu4c/source/io/release
+icu4c/source/io/x64
+icu4c/source/io/x86
 icu4c/source/layout/*.ao
 icu4c/source/layout/*.d
 icu4c/source/layout/*.o
@@ -89,6 +99,8 @@ icu4c/source/layout/debug
 icu4c/source/layout/layout.res
 icu4c/source/layout/layout.vcproj.*.*.user
 icu4c/source/layout/release
+icu4c/source/layout/x64
+icu4c/source/layout/x86
 icu4c/source/layoutex/*.ao
 icu4c/source/layoutex/*.d
 icu4c/source/layoutex/*.o
@@ -100,6 +112,8 @@ icu4c/source/layoutex/debug
 icu4c/source/layoutex/layoutex.res
 icu4c/source/layoutex/layoutex.vcproj.*.*.user
 icu4c/source/layoutex/release
+icu4c/source/layoutex/x64
+icu4c/source/layoutex/x86
 icu4c/source/lib
 icu4c/source/samples/Makefile
 icu4c/source/samples/all/all.ncb
@@ -208,6 +222,8 @@ icu4c/source/stubdata/libsicu*.*
 icu4c/source/stubdata/release
 icu4c/source/stubdata/stubdata.vcproj.*.*.user
 icu4c/source/stubdata/stubdatabuilt.txt
+icu4c/source/stubdata/x64
+icu4c/source/stubdata/x86
 icu4c/source/test/Makefile
 icu4c/source/test/cintltst/*.d
 icu4c/source/test/cintltst/*.o
@@ -220,6 +236,8 @@ icu4c/source/test/cintltst/cintltst.exe
 icu4c/source/test/cintltst/cintltst.vcproj.*.*.user
 icu4c/source/test/cintltst/debug
 icu4c/source/test/cintltst/release
+icu4c/source/test/cintltst/x64
+icu4c/source/test/cintltst/x86
 icu4c/source/test/compat/Makefile
 icu4c/source/test/hdrtst/Makefile
 icu4c/source/test/intltest/*.d
@@ -234,6 +252,8 @@ icu4c/source/test/intltest/intltest
 icu4c/source/test/intltest/intltest.exe
 icu4c/source/test/intltest/intltest.vcproj.*.*.user
 icu4c/source/test/intltest/release
+icu4c/source/test/intltest/x64
+icu4c/source/test/intltest/x86
 icu4c/source/test/iotest/*.d
 icu4c/source/test/iotest/*.o
 icu4c/source/test/iotest/Debug
@@ -244,6 +264,8 @@ icu4c/source/test/iotest/iotest
 icu4c/source/test/iotest/iotest.exe
 icu4c/source/test/iotest/iotest.vcproj.*.*.user
 icu4c/source/test/iotest/release
+icu4c/source/test/iotest/x64
+icu4c/source/test/iotest/x86
 icu4c/source/test/letest/*.d
 icu4c/source/test/letest/*.o
 icu4c/source/test/letest/Debug
@@ -254,6 +276,8 @@ icu4c/source/test/letest/letest
 icu4c/source/test/letest/letest.exe
 icu4c/source/test/letest/letest.vcproj.*.*.user
 icu4c/source/test/letest/release
+icu4c/source/test/letest/x64
+icu4c/source/test/letest/x86
 icu4c/source/test/perf/Makefile
 icu4c/source/test/perf/charperf/*.d
 icu4c/source/test/perf/charperf/*.o
@@ -363,6 +387,8 @@ icu4c/source/tools/ctestfw/debug
 icu4c/source/tools/ctestfw/libicutest*
 icu4c/source/tools/ctestfw/libsicutest*
 icu4c/source/tools/ctestfw/release
+icu4c/source/tools/ctestfw/x64
+icu4c/source/tools/ctestfw/x86
 icu4c/source/tools/dumpce/*.css
 icu4c/source/tools/dumpce/*.d
 icu4c/source/tools/dumpce/*.html
@@ -381,6 +407,8 @@ icu4c/source/tools/genbidi/genbidi
 icu4c/source/tools/genbidi/genbidi.[0-9]
 icu4c/source/tools/genbidi/genbidi.vcproj.*.*.user
 icu4c/source/tools/genbidi/release
+icu4c/source/tools/genbidi/x64
+icu4c/source/tools/genbidi/x86
 icu4c/source/tools/genbrk/*.d
 icu4c/source/tools/genbrk/*.o
 icu4c/source/tools/genbrk/*.pdb
@@ -393,6 +421,8 @@ icu4c/source/tools/genbrk/genbrk
 icu4c/source/tools/genbrk/genbrk.1
 icu4c/source/tools/genbrk/genbrk.vcproj.*.*.user
 icu4c/source/tools/genbrk/release
+icu4c/source/tools/genbrk/x64
+icu4c/source/tools/genbrk/x86
 icu4c/source/tools/gencase/*.d
 icu4c/source/tools/gencase/*.ncb
 icu4c/source/tools/gencase/*.o
@@ -407,6 +437,8 @@ icu4c/source/tools/gencase/gencase
 icu4c/source/tools/gencase/gencase.[0-9]
 icu4c/source/tools/gencase/gencase.vcproj.*.*.user
 icu4c/source/tools/gencase/release
+icu4c/source/tools/gencase/x64
+icu4c/source/tools/gencase/x86
 icu4c/source/tools/genccode/*.d
 icu4c/source/tools/genccode/*.o
 icu4c/source/tools/genccode/*.pdb
@@ -419,6 +451,8 @@ icu4c/source/tools/genccode/genccode
 icu4c/source/tools/genccode/genccode.8
 icu4c/source/tools/genccode/genccode.vcproj.*.*.user
 icu4c/source/tools/genccode/release
+icu4c/source/tools/genccode/x64
+icu4c/source/tools/genccode/x86
 icu4c/source/tools/gencmn/*.d
 icu4c/source/tools/gencmn/*.o
 icu4c/source/tools/gencmn/*.pdb
@@ -432,6 +466,8 @@ icu4c/source/tools/gencmn/gencmn.8
 icu4c/source/tools/gencmn/gencmn.[0-9]
 icu4c/source/tools/gencmn/gencmn.vcproj.*.*.user
 icu4c/source/tools/gencmn/release
+icu4c/source/tools/gencmn/x64
+icu4c/source/tools/gencmn/x86
 icu4c/source/tools/gencnval/*.d
 icu4c/source/tools/gencnval/*.ncb
 icu4c/source/tools/gencnval/*.o
@@ -447,6 +483,8 @@ icu4c/source/tools/gencnval/gencnval.1
 icu4c/source/tools/gencnval/gencnval.[0-9]
 icu4c/source/tools/gencnval/gencnval.vcproj.*.*.user
 icu4c/source/tools/gencnval/release
+icu4c/source/tools/gencnval/x64
+icu4c/source/tools/gencnval/x86
 icu4c/source/tools/genctd/*.d
 icu4c/source/tools/genctd/*.o
 icu4c/source/tools/genctd/*.pdb
@@ -459,6 +497,8 @@ icu4c/source/tools/genctd/genctd
 icu4c/source/tools/genctd/genctd.1
 icu4c/source/tools/genctd/genctd.vcproj.*.*.user
 icu4c/source/tools/genctd/release
+icu4c/source/tools/genctd/x64
+icu4c/source/tools/genctd/x86
 icu4c/source/tools/gendraft/udeprctd.h
 icu4c/source/tools/gendraft/udraft.h
 icu4c/source/tools/gendraft/uintrnal.h
@@ -477,6 +517,8 @@ icu4c/source/tools/gennames/gennames
 icu4c/source/tools/gennames/gennames.[0-9]
 icu4c/source/tools/gennames/gennames.vcproj.*.*.user
 icu4c/source/tools/gennames/release
+icu4c/source/tools/gennames/x64
+icu4c/source/tools/gennames/x86
 icu4c/source/tools/gennorm/*.d
 icu4c/source/tools/gennorm/*.o
 icu4c/source/tools/gennorm/*.pdb
@@ -489,6 +531,8 @@ icu4c/source/tools/gennorm/gennorm
 icu4c/source/tools/gennorm/gennorm.[0-9]
 icu4c/source/tools/gennorm/gennorm.vcproj.*.*.user
 icu4c/source/tools/gennorm/release
+icu4c/source/tools/gennorm/x64
+icu4c/source/tools/gennorm/x86
 icu4c/source/tools/genpname/*.d
 icu4c/source/tools/genpname/*.o
 icu4c/source/tools/genpname/*.pdb
@@ -500,6 +544,8 @@ icu4c/source/tools/genpname/debug
 icu4c/source/tools/genpname/genpname
 icu4c/source/tools/genpname/genpname.vcproj.*.*.user
 icu4c/source/tools/genpname/release
+icu4c/source/tools/genpname/x64
+icu4c/source/tools/genpname/x86
 icu4c/source/tools/genprops/*.d
 icu4c/source/tools/genprops/*.ncb
 icu4c/source/tools/genprops/*.o
@@ -514,6 +560,8 @@ icu4c/source/tools/genprops/genprops
 icu4c/source/tools/genprops/genprops.[0-9]
 icu4c/source/tools/genprops/genprops.vcproj.*.*.user
 icu4c/source/tools/genprops/release
+icu4c/source/tools/genprops/x64
+icu4c/source/tools/genprops/x86
 icu4c/source/tools/genrb/*.1
 icu4c/source/tools/genrb/*.d
 icu4c/source/tools/genrb/*.o
@@ -533,6 +581,8 @@ icu4c/source/tools/genrb/genrb.[0-9]
 icu4c/source/tools/genrb/genrb.vcproj.*.*.user
 icu4c/source/tools/genrb/release
 icu4c/source/tools/genrb/temp
+icu4c/source/tools/genrb/x64
+icu4c/source/tools/genrb/x86
 icu4c/source/tools/genren/ICUunrenamed
 icu4c/source/tools/genren/Makefile.local
 icu4c/source/tools/genren/urename.*
@@ -549,6 +599,8 @@ icu4c/source/tools/gensprep/gensprep.[0-9]
 icu4c/source/tools/gensprep/gensprep.plg
 icu4c/source/tools/gensprep/gensprep.vcproj.*.*.user
 icu4c/source/tools/gensprep/release
+icu4c/source/tools/gensprep/x64
+icu4c/source/tools/gensprep/x86
 icu4c/source/tools/gentest/*.d
 icu4c/source/tools/gentest/*.o
 icu4c/source/tools/gentest/*.pdb
@@ -560,6 +612,8 @@ icu4c/source/tools/gentest/gentest
 icu4c/source/tools/gentest/gentest.exe
 icu4c/source/tools/gentest/gentest.vcproj.*.*.user
 icu4c/source/tools/gentest/release
+icu4c/source/tools/gentest/x64
+icu4c/source/tools/gentest/x86
 icu4c/source/tools/genuca/*.d
 icu4c/source/tools/genuca/*.o
 icu4c/source/tools/genuca/*.pdb
@@ -571,6 +625,8 @@ icu4c/source/tools/genuca/genuca
 icu4c/source/tools/genuca/genuca.8
 icu4c/source/tools/genuca/genuca.vcproj.*.*.user
 icu4c/source/tools/genuca/release
+icu4c/source/tools/genuca/x64
+icu4c/source/tools/genuca/x86
 icu4c/source/tools/icupkg/*.8
 icu4c/source/tools/icupkg/*.d
 icu4c/source/tools/icupkg/*.ncb
@@ -586,6 +642,8 @@ icu4c/source/tools/icupkg/icupkg
 icu4c/source/tools/icupkg/icupkg.[0-9]
 icu4c/source/tools/icupkg/icupkg.vcproj.*.*.user
 icu4c/source/tools/icupkg/release
+icu4c/source/tools/icupkg/x64
+icu4c/source/tools/icupkg/x86
 icu4c/source/tools/icuswap/*.d
 icu4c/source/tools/icuswap/*.ncb
 icu4c/source/tools/icuswap/*.o
@@ -613,6 +671,8 @@ icu4c/source/tools/makeconv/makeconv
 icu4c/source/tools/makeconv/makeconv.[0-9]
 icu4c/source/tools/makeconv/makeconv.vcproj.*.*.user
 icu4c/source/tools/makeconv/release
+icu4c/source/tools/makeconv/x64
+icu4c/source/tools/makeconv/x86
 icu4c/source/tools/pkgdata/*.1
 icu4c/source/tools/pkgdata/*.d
 icu4c/source/tools/pkgdata/*.ncb
@@ -628,6 +688,8 @@ icu4c/source/tools/pkgdata/pkgdata
 icu4c/source/tools/pkgdata/pkgdata.[0-9]
 icu4c/source/tools/pkgdata/pkgdata.vcproj.*.*.user
 icu4c/source/tools/pkgdata/release
+icu4c/source/tools/pkgdata/x64
+icu4c/source/tools/pkgdata/x86
 icu4c/source/tools/toolutil/*.d
 icu4c/source/tools/toolutil/*.ncb
 icu4c/source/tools/toolutil/*.o
@@ -641,6 +703,8 @@ icu4c/source/tools/toolutil/debug
 icu4c/source/tools/toolutil/libicu*
 icu4c/source/tools/toolutil/release
 icu4c/source/tools/toolutil/toolutil.vcproj.*.*.user
+icu4c/source/tools/toolutil/x64
+icu4c/source/tools/toolutil/x86
 icu4c/source/tools/tzcode/Makefile
 icu4c/source/tools/tzcode/ZoneMetaData.java
 icu4c/source/tools/tzcode/africa