diff --git a/README.md b/README.md
index 28983761..56875d96 100644
--- a/README.md
+++ b/README.md
@@ -187,7 +187,7 @@ A list of the layers in the codebase and their associated namespaces is below:
 - `hash_store` (`HS_`): Implements a cache for general data blobs, keyed by a
   128-bit hash of the data. Used as a general data store by other layers.
 - `metagen` (`MG_`): A metaprogram which is used to generate primarily code and
-  data tables. Consumes Metadesk files, stored with the extension `.mc`, and
+  data tables. Consumes Metadesk files, stored with the extension `.mdesk`, and
   generates C code which is then included by hand-written C code. Currently, it
   does not analyze the codebase's hand-written C code, but in principle this is
   possible. This allows easier & less-error-prone management of large data
diff --git a/project.4coder b/project.4coder
index 33fbb625..2122c0fb 100644
--- a/project.4coder
+++ b/project.4coder
@@ -18,9 +18,8 @@ patterns =
   "*.bfs",
   "*.html",
   "*.txt",
-  "*.ds",
   "*.md",
-  "*.mc",
+  "*.mdesk",
   "*.asm",
 };
 
diff --git a/src/ctrl/ctrl.mc b/src/ctrl/ctrl.mdesk
similarity index 100%
rename from src/ctrl/ctrl.mc
rename to src/ctrl/ctrl.mdesk
diff --git a/src/df/core/df_core.mc b/src/df/core/df_core.mdesk
similarity index 100%
rename from src/df/core/df_core.mc
rename to src/df/core/df_core.mdesk
diff --git a/src/df/gfx/df_gfx.mc b/src/df/gfx/df_gfx.mdesk
similarity index 100%
rename from src/df/gfx/df_gfx.mc
rename to src/df/gfx/df_gfx.mdesk
diff --git a/src/draw/draw.mc b/src/draw/draw.mdesk
similarity index 100%
rename from src/draw/draw.mc
rename to src/draw/draw.mdesk
diff --git a/src/eval/eval.mc b/src/eval/eval.mdesk
similarity index 100%
rename from src/eval/eval.mc
rename to src/eval/eval.mdesk
diff --git a/src/metagen/metagen_main.c b/src/metagen/metagen_main.c
index c6a501a6..6942687a 100644
--- a/src/metagen/metagen_main.c
+++ b/src/metagen/metagen_main.c
@@ -86,7 +86,7 @@ int main(int argument_count, char **arguments)
     {
       String8 file_path = n->string;
       String8 file_ext = str8_skip_last_dot(file_path);
-      if(str8_match(file_ext, str8_lit("mc"), 0))
+      if(str8_match(file_ext, str8_lit("mdesk"), 0))
       {
         String8 data = os_data_from_file_path(mg_arena, file_path);
         MD_TokenizeResult tokenize = md_tokenize_from_text(mg_arena, data);
diff --git a/src/os/gfx/os_gfx.mc b/src/os/gfx/os_gfx.mdesk
similarity index 100%
rename from src/os/gfx/os_gfx.mc
rename to src/os/gfx/os_gfx.mdesk
diff --git a/src/regs/regs.mc b/src/regs/regs.mdesk
similarity index 100%
rename from src/regs/regs.mc
rename to src/regs/regs.mdesk
diff --git a/src/render/d3d11/render_d3d11.mc b/src/render/d3d11/render_d3d11.mdesk
similarity index 100%
rename from src/render/d3d11/render_d3d11.mc
rename to src/render/d3d11/render_d3d11.mdesk
diff --git a/src/render/render_core.mc b/src/render/render_core.mdesk
similarity index 100%
rename from src/render/render_core.mc
rename to src/render/render_core.mdesk
diff --git a/src/type_graph/type_graph.mc b/src/type_graph/type_graph.mdesk
similarity index 100%
rename from src/type_graph/type_graph.mc
rename to src/type_graph/type_graph.mdesk
diff --git a/src/ui/ui.mc b/src/ui/ui.mdesk
similarity index 100%
rename from src/ui/ui.mc
rename to src/ui/ui.mdesk