diff --git a/CMakeLists.txt b/CMakeLists.txt
index 44051a1..6aeb531 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -24,10 +24,18 @@ set(BIN "${CMAKE_CURRENT_BINARY_DIR}")
 add_compile_options(-Wall -Wextra -std=c11 -Og -g -D_GNU_SOURCE)
 
 # fxg1a
-add_executable(fxg1a fxg1a/dump.c fxg1a/edit.c fxg1a/file.c fxg1a/icon.c
-  fxg1a/main.c fxg1a/util.c)
-target_include_directories(fxg1a PUBLIC fxg1a/)
+add_executable(fxg1a fxgxa/dump.c fxgxa/edit.c fxgxa/file.c fxgxa/icon.c
+  fxgxa/main.c fxgxa/util.c)
+target_include_directories(fxg1a PUBLIC fxgxa/)
 target_link_libraries(fxg1a PkgConfig::libpng)
+target_compile_definitions(fxg1a PRIVATE -DFXGXA_FORMAT_G1A)
+
+# fxg3a
+add_executable(fxg3a fxgxa/dump.c fxgxa/edit.c fxgxa/file.c fxgxa/icon.c
+  fxgxa/main.c fxgxa/util.c)
+target_include_directories(fxg3a PUBLIC fxgxa/)
+target_link_libraries(fxg3a PkgConfig::libpng)
+target_compile_definitions(fxg3a PRIVATE -DFXGXA_FORMAT_G3A)
 
 # fxsdk
 add_custom_command(OUTPUT "${BIN}/fxsdk.sh"
@@ -58,6 +66,8 @@ install(DIRECTORY fxsdk/assets DESTINATION share/fxsdk)
 install(DIRECTORY fxsdk/cmake/ DESTINATION lib/cmake/fxsdk)
 # fxg1a
 install(TARGETS fxg1a)
+# fxg3a
+install(TARGETS fxg3a)
 # fxconv
 install(PROGRAMS fxconv/fxconv-main.py TYPE BIN RENAME fxconv)
 install(FILES fxconv/fxconv.py TYPE BIN)
diff --git a/README.md b/README.md
index b6ec829..62b6d36 100644
--- a/README.md
+++ b/README.md
@@ -88,6 +88,12 @@ don't need to worry about it, but here are the main commands:
 * `fxg1a -r`: Repair control bytes and checksums for broken files
 * `fxg1a -x`: Extract icon into a PNG file
 
+**G3A file generation** with `fxg3a`
+
+`fxg3a` is very similar to `fxg1a`, but generates and edits g3a files instead.
+These files are used for fx-CG 10/20/50 programs. The main commands are
+identical.
+
 **Asset conversion** with `fxconv`
 
 `fxconv` is a programmable asset converter that converts images, fonts and
diff --git a/fxg1a/dump.c b/fxgxa/dump.c
similarity index 100%
rename from fxg1a/dump.c
rename to fxgxa/dump.c
diff --git a/fxg1a/edit.c b/fxgxa/edit.c
similarity index 100%
rename from fxg1a/edit.c
rename to fxgxa/edit.c
diff --git a/fxg1a/endianness.h b/fxgxa/endianness.h
similarity index 100%
rename from fxg1a/endianness.h
rename to fxgxa/endianness.h
diff --git a/fxg1a/file.c b/fxgxa/file.c
similarity index 100%
rename from fxg1a/file.c
rename to fxgxa/file.c
diff --git a/fxg1a/fxg1a.h b/fxgxa/fxg1a.h
similarity index 100%
rename from fxg1a/fxg1a.h
rename to fxgxa/fxg1a.h
diff --git a/fxg1a/g1a.h b/fxgxa/g1a.h
similarity index 100%
rename from fxg1a/g1a.h
rename to fxgxa/g1a.h
diff --git a/fxg1a/icon.c b/fxgxa/icon.c
similarity index 100%
rename from fxg1a/icon.c
rename to fxgxa/icon.c
diff --git a/fxg1a/main.c b/fxgxa/main.c
similarity index 100%
rename from fxg1a/main.c
rename to fxgxa/main.c
diff --git a/fxg1a/util.c b/fxgxa/util.c
similarity index 100%
rename from fxg1a/util.c
rename to fxgxa/util.c