diff --git a/platform/platform-impl/src/com/intellij/openapi/fileTypes/impl/FileTypeManagerImpl.java b/platform/platform-impl/src/com/intellij/openapi/fileTypes/impl/FileTypeManagerImpl.java
index bfeb57621578..1f053bfcfbec 100644
--- a/platform/platform-impl/src/com/intellij/openapi/fileTypes/impl/FileTypeManagerImpl.java
+++ b/platform/platform-impl/src/com/intellij/openapi/fileTypes/impl/FileTypeManagerImpl.java
@@ -60,10 +60,7 @@ import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 import org.jetbrains.annotations.TestOnly;
 
-import java.io.DataInputStream;
-import java.io.DataOutputStream;
-import java.io.IOException;
-import java.io.InputStream;
+import java.io.*;
 import java.net.URL;
 import java.nio.charset.Charset;
 import java.util.*;
@@ -672,6 +669,13 @@ public class FileTypeManagerImpl extends FileTypeManagerEx implements Persistent
         int n = newStream.read(buffer, 0, buffer.length);
         newStream.close();
         log("F: Redetect run for file: " + file.getName() + "; result: "+fileType.getName()+"; processor ret: "+r+"; stream: "+inputStream+"; newStream: "+newStream+"; read: "+n+"; buffer: "+Arrays.toString(buffer));
+        try {
+          InputStream in = ReflectionUtil.getField(newStream.getClass(), newStream, InputStream.class, "in");
+          String path = ReflectionUtil.getField(in.getClass(), in, String.class, "path");
+          log("F: inputStream.in: " + in + "("+in.getClass()+"; in.path: "+path+"; path.exists "+new File(path).exists()+"; canRead: "+new File(path).canRead());
+        }
+        catch (Exception ignored) {
+        }
       }
 
       if (LOG.isDebugEnabled()) {