diff --git a/AVRsack/ASFileTree.swift b/AVRsack/ASFileTree.swift
index 2651874..f35526b 100644
--- a/AVRsack/ASFileTree.swift
+++ b/AVRsack/ASFileTree.swift
@@ -79,6 +79,9 @@ class ASFileNode {
     func paths(rootPath: NSString) -> [NSString] {
         return [NSString]()
     }
+    func exists() -> Bool {
+        return true
+    }
 }
 
 class ASLogNode : ASFileNode {
@@ -200,6 +203,9 @@ class ASFileItem : ASFileNode {
     override func paths(rootPath: NSString) -> [NSString] {
         return [relativePath(rootPath)]
     }
+    override func exists() -> Bool {
+        return url.checkResourceIsReachableAndReturnError(nil)
+    }
 }
 
 class ASFileTree : NSObject, NSOutlineViewDataSource {
diff --git a/AVRsack/ASProjDoc.swift b/AVRsack/ASProjDoc.swift
index fe3970d..270ab98 100644
--- a/AVRsack/ASProjDoc.swift
+++ b/AVRsack/ASProjDoc.swift
@@ -279,10 +279,16 @@ class ASProjDoc: NSDocument, NSOutlineViewDelegate, NSMenuDelegate {
         updateChangeCount(.ChangeDone)
     }
     func outlineView(outlineView: NSOutlineView, willDisplayCell cell: AnyObject, forTableColumn tableColumn: NSTableColumn?, item: AnyObject) {
-        if item === files.root || item === files.buildLog || item === files.uploadLog || item === files.disassembly {
-            (cell as NSCell).font = NSFont.boldSystemFontOfSize(13.0)
-        } else {
-            (cell as NSCell).font = NSFont.systemFontOfSize(13.0)
+        if let textCell = cell as? NSTextFieldCell {
+            textCell.textColor = NSColor.blackColor()
+            if item === files.root || item === files.buildLog || item === files.uploadLog || item === files.disassembly {
+                textCell.font = NSFont.boldSystemFontOfSize(13.0)
+            } else {
+                textCell.font = NSFont.systemFontOfSize(13.0)
+                if !(item as ASFileNode).exists() {
+                    textCell.textColor = NSColor.redColor()
+                }
+            }
         }
     }