diff --git a/plugins/ktstandard/contents/PowerpointIndexer.php b/plugins/ktstandard/contents/PowerpointIndexer.php
index 6bf08b5..97f842d 100644
--- a/plugins/ktstandard/contents/PowerpointIndexer.php
+++ b/plugins/ktstandard/contents/PowerpointIndexer.php
@@ -6,6 +6,12 @@ class KTPowerpointIndexerTrigger {
     }
 
     function transform() {
+        $iMimeTypeId = $this->oDocument->getMimeTypeId();
+        $sMimeType = KTMime::getMimeTypeName($iMimeTypeId);
+        if ($sMimeType != "application/msword") {
+            return;
+        }
+
         $oStorage = KTStorageManagerUtil::getSingleton();
         $sFile = $oStorage->temporaryFile($this->oDocument);
 
diff --git a/plugins/ktstandard/contents/WordIndexer.php b/plugins/ktstandard/contents/WordIndexer.php
index 8327f9d..cb6d7ff 100644
--- a/plugins/ktstandard/contents/WordIndexer.php
+++ b/plugins/ktstandard/contents/WordIndexer.php
@@ -6,6 +6,12 @@ class KTWordIndexerTrigger {
     }
 
     function transform() {
+        $iMimeTypeId = $this->oDocument->getMimeTypeId();
+        $sMimeType = KTMime::getMimeTypeName($iMimeTypeId);
+        if ($sMimeType != "application/msword") {
+            return;
+        }
+
         $oStorage = KTStorageManagerUtil::getSingleton();
         $sFile = $oStorage->temporaryFile($this->oDocument);