diff --git a/util/lib.c b/util/lib.c
new file mode 100644
index 0000000..bd7a5eb
--- /dev/null
+++ b/util/lib.c
@@ -0,0 +1,29 @@
+#include <windows.h>
+
+#include <stdbool.h>
+
+wchar_t *module_file_name(HMODULE module)
+{
+    size_t buf_len;
+    DWORD len;
+    wchar_t *buf;
+
+    buf_len = MAX_PATH;
+    buf = malloc(buf_len * sizeof(*buf));
+
+    while (true) {
+        len = GetModuleFileNameW(module, buf, buf_len);
+
+        if (GetLastError() != ERROR_INSUFFICIENT_BUFFER) {
+            buf_len = len;
+            buf = realloc(buf, buf_len * sizeof(*buf));
+
+            break;
+        }
+
+        buf_len *= 2;
+        buf = realloc(buf, buf_len * sizeof(*buf));
+    }
+
+    return buf;
+}
diff --git a/util/lib.h b/util/lib.h
new file mode 100644
index 0000000..f3d717e
--- /dev/null
+++ b/util/lib.h
@@ -0,0 +1,5 @@
+#pragma once
+
+#include <windows.h>
+
+wchar_t *module_file_name(HMODULE module);
diff --git a/util/meson.build b/util/meson.build
index c3c07f9..575d123 100644
--- a/util/meson.build
+++ b/util/meson.build
@@ -17,6 +17,8 @@ util_lib = static_library(
         'dprintf.h',
         'dump.c',
         'dump.h',
+        'lib.c',
+        'lib.h',
         'str.c',
         'str.h',
     ],