diff --git a/Squirrel.xcodeproj/project.pbxproj b/Squirrel.xcodeproj/project.pbxproj
index 813deaeb0..edde5866a 100644
--- a/Squirrel.xcodeproj/project.pbxproj
+++ b/Squirrel.xcodeproj/project.pbxproj
@@ -36,9 +36,6 @@
 		447765CA25C30E97002415AF /* Sparkle.framework in Copy 3rd-party Frameworks */ = {isa = PBXBuildFile; fileRef = 447765C725C30E6B002415AF /* Sparkle.framework */; settings = {ATTRIBUTES = (CodeSignOnCopy, RemoveHeadersOnCopy, ); }; };
 		448363DD25BDBBED0022C7BA /* pinyin.yaml in Copy Shared Support Files */ = {isa = PBXBuildFile; fileRef = 448363D925BDBBBF0022C7BA /* pinyin.yaml */; };
 		448363DE25BDBBED0022C7BA /* zhuyin.yaml in Copy Shared Support Files */ = {isa = PBXBuildFile; fileRef = 448363DA25BDBBBF0022C7BA /* zhuyin.yaml */; };
-		207BACE41D4D6308E1699BB5 /* zh-hant-t-essay-bgw.gram in Copy Shared Support Files */ = {isa = PBXBuildFile; fileRef = B93B1B771BA746E5EF3B229F /* zh-hant-t-essay-bgw.gram */; };
-		DF31C997BE556AC470BE6DFC /* zh-hant-t-essay-bgc.gram in Copy Shared Support Files */ = {isa = PBXBuildFile; fileRef = 7DE20C60B65C3F0D24E29547 /* zh-hant-t-essay-bgc.gram */; };
-		91C92106F786AEFE06164570 /* grammar.yaml in Copy Shared Support Files */ = {isa = PBXBuildFile; fileRef = 4639481E7541071A4259FDE6 /* grammar.yaml */; };
 		44986A95184B421700B3278D /* LICENSE.txt in Resources */ = {isa = PBXBuildFile; fileRef = 44986A93184B421700B3278D /* LICENSE.txt */; };
 		44986A96184B421700B3278D /* README.md in Resources */ = {isa = PBXBuildFile; fileRef = 44986A94184B421700B3278D /* README.md */; };
 		44AEBC7521F569FD00344375 /* key_bindings.yaml in Copy Shared Support Files */ = {isa = PBXBuildFile; fileRef = 44AEBC7221F569CF00344375 /* key_bindings.yaml */; };
@@ -163,9 +160,6 @@
 			files = (
 				448363DD25BDBBED0022C7BA /* pinyin.yaml in Copy Shared Support Files */,
 				448363DE25BDBBED0022C7BA /* zhuyin.yaml in Copy Shared Support Files */,
-				207BACE41D4D6308E1699BB5 /* zh-hant-t-essay-bgw.gram in Copy Shared Support Files */,
-				DF31C997BE556AC470BE6DFC /* zh-hant-t-essay-bgc.gram in Copy Shared Support Files */,
-				91C92106F786AEFE06164570 /* grammar.yaml in Copy Shared Support Files */,
 				441E637722B7E96F006DCCDD /* bopomofo_express.schema.yaml in Copy Shared Support Files */,
 				441E637822B7E96F006DCCDD /* bopomofo_tw.schema.yaml in Copy Shared Support Files */,
 				441E637922B7E96F006DCCDD /* bopomofo.schema.yaml in Copy Shared Support Files */,
@@ -494,9 +488,6 @@
 			children = (
 				448363D925BDBBBF0022C7BA /* pinyin.yaml */,
 				448363DA25BDBBBF0022C7BA /* zhuyin.yaml */,
-				B93B1B771BA746E5EF3B229F /* zh-hant-t-essay-bgw.gram */,
-				7DE20C60B65C3F0D24E29547 /* zh-hant-t-essay-bgc.gram */,
-				4639481E7541071A4259FDE6 /* grammar.yaml */,
 				441E636C22B7E90D006DCCDD /* bopomofo_express.schema.yaml */,
 				441E636722B7E90D006DCCDD /* bopomofo_tw.schema.yaml */,
 				441E636822B7E90D006DCCDD /* bopomofo.schema.yaml */,
diff --git a/package/add_data_files b/package/add_data_files
index fab06178f..e78a290e7 100755
--- a/package/add_data_files
+++ b/package/add_data_files
@@ -35,7 +35,19 @@ copy_files_entry() {
 }
 
 file_ref_entry() {
-    echo "$2 /* $3 */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text; name = $3; path = data/plum/$3; sourceTree = \"<group>\"; };"
+    # Pick lastKnownFileType by extension;
+    # non-text assets (e.g. .gram) use the generic file type with quoted name/path
+    case "$3" in
+        *.yaml)
+            echo "$2 /* $3 */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text.yaml; name = $3; path = data/plum/$3; sourceTree = \"<group>\"; };"
+            ;;
+        *.txt)
+            echo "$2 /* $3 */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text; name = $3; path = data/plum/$3; sourceTree = \"<group>\"; };"
+            ;;
+        *)
+            echo "$2 /* $3 */ = {isa = PBXFileReference; lastKnownFileType = file; name = \"$3\"; path = \"data/plum/$3\"; sourceTree = \"<group>\"; };"
+            ;;
+    esac
 }
 
 group_entry() {