diff --git a/SLS_C/Makefile.nmake b/SLS_C/Makefile.nmake
new file mode 100644
index 0000000..33e5ed4
--- /dev/null
+++ b/SLS_C/Makefile.nmake
@@ -0,0 +1,69 @@
+# MSVC nmake build file for SLS
+
+CC = cl
+CFLAGS = /std:c11 /W4 /WX /Zi /I include
+LDFLAGS =
+
+SRCDIR = src
+OBJDIR = obj
+BINDIR = bin
+TESTDIR = tests
+
+TARGET = $(BINDIR)\sls.exe
+TEST_TARGET = $(BINDIR)\sls_tests.exe
+
+# --- MANUALLY LIST SOURCE FILES HERE ---
+SOURCES = \
+    $(SRCDIR)\main.c \
+    $(SRCDIR)\lexer.c \
+    $(SRCDIR)\string.c
+
+TEST_SOURCES = \
+    $(TESTDIR)\lexer_tests.c
+# ---------------------------------------
+
+OBJECTS = $(SOURCES:$(SRCDIR)\%.c=$(OBJDIR)\%.obj)
+TEST_OBJECTS = $(TEST_SOURCES:$(TESTDIR)\%.c=$(OBJDIR)\%.obj)
+
+# Default rule
+all: build
+
+# === BUILD MAIN PROGRAM ===
+
+build: $(TARGET)
+
+$(TARGET): dirs $(OBJECTS)
+    link $(OBJECTS) /OUT:$@ $(LDFLAGS)
+
+# === COMPILE RULE ===
+
+$(OBJDIR)\%.obj: $(SRCDIR)\%.c
+    $(CC) $(CFLAGS) /c $< /Fo$@
+
+$(OBJDIR)\%.obj: $(TESTDIR)\%.c
+    $(CC) $(CFLAGS) /c $< /Fo$@
+
+# === RUN PROGRAM ===
+
+run: $(TARGET)
+    $(TARGET)
+
+# === TEST BUILD & RUN ===
+
+test: $(TEST_TARGET)
+    $(TEST_TARGET)
+
+$(TEST_TARGET): dirs $(TEST_OBJECTS) $(OBJECTS:$(OBJDIR)\main.obj=)
+    link $(TEST_OBJECTS) $(OBJECTS:$(OBJDIR)\main.obj=) /OUT:$@ $(LDFLAGS)
+
+# === CREATE DIRECTORIES ===
+
+dirs:
+    if not exist $(OBJDIR) mkdir $(OBJDIR)
+    if not exist $(BINDIR) mkdir $(BINDIR)
+
+# === CLEAN ===
+
+clean:
+    rmdir /s /q $(OBJDIR)
+    rmdir /s /q $(BINDIR)
diff --git a/SLS_C/README.md b/SLS_C/README.md
index 5cd8f39..cce7e88 100644
--- a/SLS_C/README.md
+++ b/SLS_C/README.md
@@ -4,8 +4,18 @@ This is the C implementation for the YREA SLS interpreter.
 
 ## Running
 
+### Linux (UNIX)
+
 Build Project: `make build`  
 Build and Run Project: `make run`  
 Build and Run Tests: `make test`
 
 Interpreter binary location: `./bin/sls`
+
+### Windows
+
+Build Project: `nmake /f Makefile.nmake build`  
+Build and Run Project: `nmake /f Makefile.nmake run`  
+Build and Run Tests: `nmake /f Makefile.nmake test`
+
+Interpreter binary location: `.\bin\sls.exe`