diff --git a/CMakeLists.txt b/CMakeLists.txt
index 0f958cc6..be5d3928 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -169,14 +169,12 @@ set(XEUS_CPP_HEADERS
     #src/xinspect.hpp
     #src/xsystem.hpp
     #src/xparser.hpp
-    #src/xmagics/os.hpp
 )
 
 set(XEUS_CPP_SRC
     src/xholder.cpp
     src/xinput.cpp
     src/xinterpreter.cpp
-    src/xmagics/os.cpp
     src/xoptions.cpp
     src/xparser.cpp
     src/xutils.cpp
@@ -184,8 +182,8 @@ set(XEUS_CPP_SRC
 
 if(NOT EMSCRIPTEN)
     list(APPEND XEUS_CPP_SRC
-        src/xmagics/xassist.hpp
         src/xmagics/xassist.cpp
+        src/xmagics/os.cpp
     )
 endif()
 
diff --git a/src/xinterpreter.cpp b/src/xinterpreter.cpp
index 2205ff5c..f099b688 100644
--- a/src/xinterpreter.cpp
+++ b/src/xinterpreter.cpp
@@ -17,8 +17,8 @@
 
 #include "xinput.hpp"
 #include "xinspect.hpp"
-#include "xmagics/os.hpp"
 #ifndef EMSCRIPTEN
+#include "xmagics/os.hpp"
 #include "xmagics/xassist.hpp"
 #endif
 #include "xparser.hpp"
@@ -371,12 +371,14 @@ __get_cxx_version ()
 
     void interpreter::init_magic()
     {
-        // preamble_manager["magics"].get_cast<xmagics_manager>().register_magic("executable", executable(m_interpreter));
-        // preamble_manager["magics"].get_cast<xmagics_manager>().register_magic("file", writefile());
-        // preamble_manager["magics"].get_cast<xmagics_manager>().register_magic("timeit", timeit(&m_interpreter));
+        // preamble_manager["magics"].get_cast<xmagics_manager>().register_magic("executable",
+        // executable(m_interpreter));
+        // preamble_manager["magics"].get_cast<xmagics_manager>().register_magic("timeit",
+        // timeit(&m_interpreter));
         // preamble_manager["magics"].get_cast<xmagics_manager>().register_magic("python", pythonexec());
 #ifndef EMSCRIPTEN
         preamble_manager["magics"].get_cast<xmagics_manager>().register_magic("xassist", xassist());
+        preamble_manager["magics"].get_cast<xmagics_manager>().register_magic("file", writefile());
 #endif
     }
 }
diff --git a/test/test_interpreter.cpp b/test/test_interpreter.cpp
index 0b785ec4..a4fe3bb1 100644
--- a/test/test_interpreter.cpp
+++ b/test/test_interpreter.cpp
@@ -1026,4 +1026,63 @@ TEST_SUITE("xassist"){
         std::remove("ollama_model.txt");
     }
 
-}
\ No newline at end of file
+}
+
+
+TEST_SUITE("file") {
+    TEST_CASE("Write") {
+        xcpp::writefile wf;
+        std::string line = "%%file testfile.txt";
+        std::string cell = "Hello, World!";
+
+        wf(line, cell);
+
+        std::ifstream infile("testfile.txt");
+        std::string content;
+        std::getline(infile, content);
+
+        REQUIRE(content == "Hello, World!");
+        infile.close();
+    }
+    TEST_CASE("Overwrite") {
+        xcpp::writefile wf;
+        std::string line = "%%file testfile.txt";
+        std::string cell = "Hello, World!";
+
+        wf(line, cell);
+
+        std::string overwrite_cell = "Overwrite test";
+
+        wf(line, overwrite_cell);
+
+        std::ifstream infile("testfile.txt");
+        std::string content;
+        std::getline(infile, content);
+
+        REQUIRE(content == overwrite_cell);
+        infile.close();
+    }
+    TEST_CASE("Append") {
+        xcpp::writefile wf;
+        std::string line = "%%file testfile.txt";
+        std::string cell = "Hello, World!";
+
+        wf(line, cell);
+
+        std::string append_line = "%%file -a testfile.txt";
+        std::string append_cell = "Hello, again!";
+
+        wf(append_line, append_cell);
+
+        std::ifstream infile("testfile.txt");
+        std::vector<std::string> lines;
+        std::string content;
+        while(std::getline(infile, content)) {
+            lines.push_back(content);
+        }
+
+        REQUIRE(lines[0] == "Hello, World!");
+        REQUIRE(lines[1] == "Hello, again!");
+        infile.close();
+    }
+}