diff --git a/include/BIOS/BIOS_sys.inc b/include/BIOS/BIOS_SYS.inc
similarity index 88%
rename from include/BIOS/BIOS_sys.inc
rename to include/BIOS/BIOS_SYS.inc
index c453986..88a4842 100644
--- a/include/BIOS/BIOS_sys.inc
+++ b/include/BIOS/BIOS_SYS.inc
@@ -18,7 +18,7 @@
 ; OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 ; SOFTWARE.
 
-%include 'BIOS/func/a20enable.inc'
-%include 'BIOS/func/E820_memory_map.inc'
-%include 'BIOS/func/ext_read.inc'
-%include 'BIOS/func/video.inc'
\ No newline at end of file
+%include 'BIOS/func/a20enable.nasm'
+%include 'BIOS/func/E820_memory_map.nasm'
+%include 'BIOS/func/ext_read.nasm'
+%include 'BIOS/func/video.nasm'
\ No newline at end of file
diff --git a/include/BIOS/func/E820_memory_map.inc b/include/BIOS/func/E820_memory_map.nasm
similarity index 100%
rename from include/BIOS/func/E820_memory_map.inc
rename to include/BIOS/func/E820_memory_map.nasm
diff --git a/include/BIOS/func/a20enable.inc b/include/BIOS/func/a20enable.nasm
similarity index 100%
rename from include/BIOS/func/a20enable.inc
rename to include/BIOS/func/a20enable.nasm
diff --git a/include/BIOS/func/ext_read.inc b/include/BIOS/func/ext_read.nasm
similarity index 100%
rename from include/BIOS/func/ext_read.inc
rename to include/BIOS/func/ext_read.nasm
diff --git a/include/BIOS/func/video.inc b/include/BIOS/func/video.nasm
similarity index 100%
rename from include/BIOS/func/video.inc
rename to include/BIOS/func/video.nasm
diff --git a/include/fat32/fat32_sys.inc b/include/fat32/FAT32_SYS.inc
similarity index 100%
rename from include/fat32/fat32_sys.inc
rename to include/fat32/FAT32_SYS.inc
diff --git a/include/util/error_func.inc b/include/util/error_func.nasm
similarity index 100%
rename from include/util/error_func.inc
rename to include/util/error_func.nasm
diff --git a/include/kmem_func.inc b/include/util/kmem_func.nasm
similarity index 100%
rename from include/kmem_func.inc
rename to include/util/kmem_func.nasm