diff --git a/modules/kobalt-plugin-api/src/main/kotlin/com/beust/kobalt/misc/Io.kt b/modules/kobalt-plugin-api/src/main/kotlin/com/beust/kobalt/misc/Io.kt
index 399bde5a..6f8694a9 100644
--- a/modules/kobalt-plugin-api/src/main/kotlin/com/beust/kobalt/misc/Io.kt
+++ b/modules/kobalt-plugin-api/src/main/kotlin/com/beust/kobalt/misc/Io.kt
@@ -33,6 +33,14 @@ class Io(val dryRun: Boolean = false) {
         }
     }
 
+    fun rename(from: File, to: File) {
+        log("rename $from $to")
+        moveFile(from, to.parentFile)
+        if (from.name != to.name) {
+            File(to, from.name).renameTo(to)
+        }
+    }
+
     fun copyDirectory(from: File, toDir: File) {
         log("cp -r $from $toDir")
 
diff --git a/modules/kobalt-plugin-api/src/main/kotlin/com/beust/kobalt/misc/JarUtils.kt b/modules/kobalt-plugin-api/src/main/kotlin/com/beust/kobalt/misc/JarUtils.kt
index 13c0ebd3..90b8aacc 100644
--- a/modules/kobalt-plugin-api/src/main/kotlin/com/beust/kobalt/misc/JarUtils.kt
+++ b/modules/kobalt-plugin-api/src/main/kotlin/com/beust/kobalt/misc/JarUtils.kt
@@ -123,9 +123,10 @@ public class JarUtils {
             return null
         }
 
-        fun extractJarFile(jarFile: File, destDir: File) {
-            val jar = JarFile(jarFile)
-            val enumEntries = jar.entries()
+        fun extractJarFile(file: File, destDir: File) = extractZipFile(JarFile(file), destDir)
+
+        fun extractZipFile(zipFile: ZipFile, destDir: File) {
+            val enumEntries = zipFile.entries()
             while (enumEntries.hasMoreElements()) {
                 val file = enumEntries.nextElement()
                 val f = File(destDir.path + File.separator + file.name)
@@ -134,7 +135,7 @@ public class JarUtils {
                     continue
                 }
 
-                jar.getInputStream(file).use { ins ->
+                zipFile.getInputStream(file).use { ins ->
                     f.parentFile.mkdirs()
                     FileOutputStream(f).use { fos ->
                         while (ins.available() > 0) {