diff --git a/tools/fsreg.bat b/tools/fsreg.bat
index c762f724..519132ce 100644
--- a/tools/fsreg.bat
+++ b/tools/fsreg.bat
@@ -18,6 +18,7 @@ if not X%1==X-u (
 
 	reg add !RegKey!\!fsname! /v Executable /t REG_SZ /d !fsexec! /f /reg:32
 	reg add !RegKey!\!fsname! /v CommandLine /t REG_SZ /d !fscmdl! /f /reg:32
+	reg add !RegKey!\!fsname! /v JobControl /t REG_DWORD /d 1 /f /reg:32
 	if not X!fssecu!==X reg add !RegKey!\!fsname! /v Security /t REG_SZ /d !fssecu! /f /reg:32
 ) else (
 	set unreg=1
diff --git a/tools/run-tests.bat b/tools/run-tests.bat
index 6b34da2a..90fbf600 100755
--- a/tools/run-tests.bat
+++ b/tools/run-tests.bat
@@ -82,6 +82,8 @@ set opt_tests=^
     sample-passthrough-fuse-x86 ^
     sample-fsx-passthrough-fuse-x86 ^
     sample-passthrough-dotnet ^
+    compat-v1.2-memfs-x64 ^
+    compat-v1.2-memfs-x86 ^
     compat-v1.1-passthrough-fuse-x64 ^
     compat-v1.1-passthrough-fuse-x86 ^
     avast-tests-x64 ^
@@ -771,6 +773,41 @@ call "%ProjRoot%\tools\fsreg" -u %1
 rmdir /s/q "%TMP%\%1"
 exit /b !RunSampleTestExit!
 
+:compat-v1.2-memfs-x64
+copy "%ProjRoot%\build\VStudio\build\%Configuration%\winfsp-*.dll" "%ProjRoot%\tst\compat\v1.2\memfs"
+call :__run_compat_memfs_test compat-memfs v1.2\memfs\memfs-x64 winfsp-tests-x64
+if !ERRORLEVEL! neq 0 goto fail
+del "%ProjRoot%\tst\compat\v1.2\memfs\winfsp-*.dll"
+exit /b 0
+
+:compat-v1.2-memfs-x86
+copy "%ProjRoot%\build\VStudio\build\%Configuration%\winfsp-*.dll" "%ProjRoot%\tst\compat\v1.2\memfs"
+call :__run_compat_memfs_test compat-memfs v1.2\memfs\memfs-x86 winfsp-tests-x86
+if !ERRORLEVEL! neq 0 goto fail
+del "%ProjRoot%\tst\compat\v1.2\memfs\winfsp-*.dll"
+exit /b 0
+
+:__run_compat_memfs_test
+set RunSampleTestExit=0
+call "%ProjRoot%\tools\fsreg" %1 "%ProjRoot%\tst\compat\%2.exe" ^
+    "-i -F NTFS -n 65536 -s 67108864 -u %%%%1 -m %%%%2" "D:P(A;;RPWPLC;;;WD)"
+echo net use L: "\\%1\share"
+net use L: "\\%1\share"
+if !ERRORLEVEL! neq 0 goto fail
+echo net use ^| findstr L:
+net use | findstr L:
+pushd >nul
+cd L: >nul 2>nul || (echo Unable to find drive L: >&2 & goto fail)
+L:
+"%ProjRoot%\build\VStudio\build\%Configuration%\%3.exe" ^
+    --external --resilient --share-prefix="\%1\share"
+if !ERRORLEVEL! neq 0 set RunSampleTestExit=1
+popd
+echo net use L: /delete
+net use L: /delete
+call "%ProjRoot%\tools\fsreg" -u %1
+exit /b !RunSampleTestExit!
+
 :compat-v1.1-passthrough-fuse-x64
 call :__run_compat_fuse_test passthrough-fuse v1.1\passthrough-fuse\passthrough-fuse-x64 winfsp-tests-x64
 if !ERRORLEVEL! neq 0 goto fail
diff --git a/tst/compat/README.md b/tst/compat/README.md
new file mode 100644
index 00000000..e587e889
--- /dev/null
+++ b/tst/compat/README.md
@@ -0,0 +1,4 @@
+This directory contains binaries for backwards compatibility testing.
+
+- `v1.1/passthrough-fuse`: testing of changes related to `struct fuse_stat_ex` (`v1.2B3`)
+- `v1.2/memfs`: testing of `FSP_FSCTL_VOLUME_PARAMS` size change (`v1.3B3`)
diff --git a/tst/compat/v1.1/passthrough-fuse/README.md b/tst/compat/v1.1/passthrough-fuse/README.md
deleted file mode 100644
index 01ad2342..00000000
--- a/tst/compat/v1.1/passthrough-fuse/README.md
+++ /dev/null
@@ -1,3 +0,0 @@
-This directory contains binaries of `passthrough-fuse` from release `v1.2B2`. Both `x64` and `x86` binaries are provided.
-
-The WinFsp-FUSE layer added support for `struct fuse_stat_ex` in `v1.2B3` which was a potentially breaking change for backwards compatibility. These binaries are used to verify that WinFsp-FUSE remains backwards compatible.
diff --git a/tst/compat/v1.2/memfs/memfs-x64.exe b/tst/compat/v1.2/memfs/memfs-x64.exe
new file mode 100644
index 00000000..147cdfba
Binary files /dev/null and b/tst/compat/v1.2/memfs/memfs-x64.exe differ
diff --git a/tst/compat/v1.2/memfs/memfs-x86.exe b/tst/compat/v1.2/memfs/memfs-x86.exe
new file mode 100644
index 00000000..e240be8f
Binary files /dev/null and b/tst/compat/v1.2/memfs/memfs-x86.exe differ