diff --git a/.filetree b/.filetree
new file mode 100644
index 000000000..c6704e514
--- /dev/null
+++ b/.filetree
@@ -0,0 +1,2 @@
+{"packageExtension" : ".package",
+"propertyFileExtension" : ".json" }
\ No newline at end of file
diff --git a/repository/Metacello-Core.package/Collection.extension/instance/setLoadsInMetacelloProject..st b/repository/Metacello-Core.package/Collection.extension/instance/setLoadsInMetacelloProject..st
deleted file mode 100644
index 17f23d034..000000000
--- a/repository/Metacello-Core.package/Collection.extension/instance/setLoadsInMetacelloProject..st
+++ /dev/null
@@ -1,4 +0,0 @@
-*metacello-core
-setLoadsInMetacelloProject: aMetacelloPackageSpec
-
-	aMetacelloPackageSpec setLoads: self asArray.
\ No newline at end of file
diff --git a/repository/Metacello-Core.package/String.extension/instance/setLoadsInMetacelloProject..st b/repository/Metacello-Core.package/String.extension/instance/setLoadsInMetacelloProject..st
deleted file mode 100644
index b8979204f..000000000
--- a/repository/Metacello-Core.package/String.extension/instance/setLoadsInMetacelloProject..st
+++ /dev/null
@@ -1,4 +0,0 @@
-*metacello-core
-setLoadsInMetacelloProject: aMetacelloPackageSpec
-
-	aMetacelloPackageSpec setLoads: { self }.
\ No newline at end of file
diff --git a/repository/Metacello-MC.package/Collection.extension/instance/setLoadsInMetacelloProject..st b/repository/Metacello-MC.package/Collection.extension/instance/setLoadsInMetacelloProject..st
new file mode 100644
index 000000000..ca50715b1
--- /dev/null
+++ b/repository/Metacello-MC.package/Collection.extension/instance/setLoadsInMetacelloProject..st
@@ -0,0 +1,4 @@
+*metacello-mc
+setLoadsInMetacelloProject: aMetacelloPackageSpec
+
+	aMetacelloPackageSpec setLoads: self asArray.
diff --git a/repository/Metacello-MC.package/String.extension/instance/setLoadsInMetacelloProject..st b/repository/Metacello-MC.package/String.extension/instance/setLoadsInMetacelloProject..st
new file mode 100644
index 000000000..302cf2f0d
--- /dev/null
+++ b/repository/Metacello-MC.package/String.extension/instance/setLoadsInMetacelloProject..st
@@ -0,0 +1,4 @@
+*metacello-mc
+setLoadsInMetacelloProject: aMetacelloPackageSpec
+
+	aMetacelloPackageSpec setLoads: { self }.