diff --git a/Misc/NEWS.d/next/Tests/2024-02-16-13-04-28.gh-issue-115556.rjaQ9w.rst b/Misc/NEWS.d/next/Tests/2024-02-16-13-04-28.gh-issue-115556.rjaQ9w.rst
new file mode 100644
index 00000000000..c2811b133d9
--- /dev/null
+++ b/Misc/NEWS.d/next/Tests/2024-02-16-13-04-28.gh-issue-115556.rjaQ9w.rst
@@ -0,0 +1,2 @@
+On Windows, commas passed in arguments to ``Tools\buildbot\test.bat`` and
+``PCbuild\\rt.bat`` are now properly handled.
diff --git a/PCbuild/rt.bat b/PCbuild/rt.bat
index 293f99ae135..ac530a52062 100644
--- a/PCbuild/rt.bat
+++ b/PCbuild/rt.bat
@@ -38,18 +38,18 @@ set regrtestargs=--fast-ci
 set exe=
 
 :CheckOpts
-if "%1"=="-O" (set dashO=-O)     & shift & goto CheckOpts
-if "%1"=="-q" (set qmode=yes)    & shift & goto CheckOpts
-if "%1"=="-d" (set suffix=_d)    & shift & goto CheckOpts
+if "%~1"=="-O" (set dashO=-O)     & shift & goto CheckOpts
+if "%~1"=="-q" (set qmode=yes)    & shift & goto CheckOpts
+if "%~1"=="-d" (set suffix=_d)    & shift & goto CheckOpts
 rem HACK: Need some way to infer the version number in this script
-if "%1"=="--disable-gil" (set pyname=python3.13t) & shift & goto CheckOpts
-if "%1"=="-win32" (set prefix=%pcbuild%win32) & shift & goto CheckOpts
-if "%1"=="-x64" (set prefix=%pcbuild%amd64) & shift & goto CheckOpts
-if "%1"=="-amd64" (set prefix=%pcbuild%amd64) & shift & goto CheckOpts
-if "%1"=="-arm64" (set prefix=%pcbuild%arm64) & shift & goto CheckOpts
-if "%1"=="-arm32" (set prefix=%pcbuild%arm32) & shift & goto CheckOpts
-if "%1"=="-p" (call :SetPlatform %~2) & shift & shift & goto CheckOpts
-if NOT "%1"=="" (set regrtestargs=%regrtestargs% %1) & shift & goto CheckOpts
+if "%~1"=="--disable-gil" (set pyname=python3.13t) & shift & goto CheckOpts
+if "%~1"=="-win32" (set prefix=%pcbuild%win32) & shift & goto CheckOpts
+if "%~1"=="-x64" (set prefix=%pcbuild%amd64) & shift & goto CheckOpts
+if "%~1"=="-amd64" (set prefix=%pcbuild%amd64) & shift & goto CheckOpts
+if "%~1"=="-arm64" (set prefix=%pcbuild%arm64) & shift & goto CheckOpts
+if "%~1"=="-arm32" (set prefix=%pcbuild%arm32) & shift & goto CheckOpts
+if "%~1"=="-p" (call :SetPlatform %~2) & shift & shift & goto CheckOpts
+if NOT "%~1"=="" (set regrtestargs=%regrtestargs% %~1) & shift & goto CheckOpts
 
 if not defined prefix set prefix=%pcbuild%amd64
 set exe=%prefix%\%pyname%%suffix%.exe
diff --git a/Tools/buildbot/test.bat b/Tools/buildbot/test.bat
index 781f9a4c820..0c47470a0ec 100644
--- a/Tools/buildbot/test.bat
+++ b/Tools/buildbot/test.bat
@@ -7,17 +7,10 @@ set here=%~dp0
 set rt_opts=-q -d
 set regrtest_args=
 set arm32_ssh=
+set cmdline_args=%*
+set cmdline_args=%cmdline_args:,=#COMMA#%
 
-:CheckOpts
-if "%1"=="-x64" (set rt_opts=%rt_opts% %1) & shift & goto CheckOpts
-if "%1"=="-arm64" (set rt_opts=%rt_opts% %1) & shift & goto CheckOpts
-if "%1"=="-arm32" (set rt_opts=%rt_opts% %1) & (set arm32_ssh=true) & shift & goto CheckOpts
-if "%1"=="-d" (set rt_opts=%rt_opts% %1) & shift & goto CheckOpts
-if "%1"=="-O" (set rt_opts=%rt_opts% %1) & shift & goto CheckOpts
-if "%1"=="-q" (set rt_opts=%rt_opts% %1) & shift & goto CheckOpts
-if "%1"=="+d" (set rt_opts=%rt_opts:-d=%) & shift & goto CheckOpts
-if "%1"=="+q" (set rt_opts=%rt_opts:-q=%) & shift & goto CheckOpts
-if NOT "%1"=="" (set regrtest_args=%regrtest_args% %1) & shift & goto CheckOpts
+call:CheckOpts %cmdline_args%
 
 if "%PROCESSOR_ARCHITECTURE%"=="ARM" if "%arm32_ssh%"=="true" goto NativeExecution
 if "%arm32_ssh%"=="true" goto :Arm32Ssh
@@ -49,3 +42,16 @@ echo The test worker should have the SSH agent running.
 echo Also a key must be created with ssh-keygen and added to both the buildbot worker machine
 echo and the ARM32 worker device: see https://docs.microsoft.com/en-us/windows/iot-core/connect-your-device/ssh
 exit /b 127
+
+:CheckOpts
+set arg="%~1"
+if %arg%=="-x64" (set rt_opts=%rt_opts% %1) & shift & goto CheckOpts
+if %arg%=="-arm64" (set rt_opts=%rt_opts% %1) & shift & goto CheckOpts
+if %arg%=="-arm32" (set rt_opts=%rt_opts% %1) & (set arm32_ssh=true) & shift & goto CheckOpts
+if %arg%=="-d" (set rt_opts=%rt_opts% %1) & shift & goto CheckOpts
+if %arg%=="-O" (set rt_opts=%rt_opts% %1) & shift & goto CheckOpts
+if %arg%=="-q" (set rt_opts=%rt_opts% %1) & shift & goto CheckOpts
+if %arg%=="+d" (set rt_opts=%rt_opts:-d=%) & shift & goto CheckOpts
+if %arg%=="+q" (set rt_opts=%rt_opts:-q=%) & shift & goto CheckOpts
+if NOT %arg%=="" (set regrtest_args=%regrtest_args% %arg:#COMMA#=,%) & shift & goto CheckOpts
+goto:eof