diff --git a/source/net/filebot/media/ReleaseInfo.properties b/source/net/filebot/media/ReleaseInfo.properties
index 409e82cc..50689308 100644
--- a/source/net/filebot/media/ReleaseInfo.properties
+++ b/source/net/filebot/media/ReleaseInfo.properties
@@ -47,4 +47,4 @@ pattern.diskfolder.entry: BDMV|HVDVD_TS|VIDEO_TS|AUDIO_TS|VCD|MovieObject.bdmv|V
 folder.media.roots: /Volumes:/Users:/home:/mnt:/media
 
 # system file pattern
-pattern.system.files: [.@].+|bin|initrd|opt|sbin|var|dev|lib|proc|sys|var.defaults|etc|lost.found|root|tmp|etc.defaults|mnt|run|usr|System.Volume.Information
+pattern.system.files: [.@][a-z]+|bin|initrd|opt|sbin|var|dev|lib|proc|sys|var.defaults|etc|lost.found|root|tmp|etc.defaults|mnt|run|usr|System.Volume.Information
diff --git a/source/net/filebot/util/FastFile.java b/source/net/filebot/util/FastFile.java
index d03d6eff..c5839ed3 100644
--- a/source/net/filebot/util/FastFile.java
+++ b/source/net/filebot/util/FastFile.java
@@ -58,12 +58,12 @@ public class FastFile extends File {
 
 	@Override
 	public File getCanonicalFile() throws IOException {
-		return canonicalFile != null ? canonicalFile : (canonicalFile = new FastFile(super.getCanonicalFile()));
+		return canonicalFile != null ? canonicalFile : (canonicalFile = get(super.getCanonicalFile()));
 	}
 
 	@Override
 	public File getParentFile() {
-		return parentFile != null ? parentFile : (parentFile = new FastFile(super.getParentFile()));
+		return parentFile != null ? parentFile : (parentFile = get(super.getParentFile()));
 	}
 
 	@Override
@@ -209,4 +209,8 @@ public class FastFile extends File {
 		throw new UnsupportedOperationException();
 	}
 
+	public static FastFile get(File f) {
+		return f == null ? null : new FastFile(f);
+	}
+
 }