Index: Framework/PCProject.m
===================================================================
--- Framework/PCProject.m	(revision 26126)
+++ Framework/PCProject.m	(working copy)
@@ -894,7 +894,7 @@
     }
   else if ([key isEqualToString:PCInterfaces])
     {
-      return [NSArray arrayWithObjects:@"gmodel",@"gorm", @"gsmarkup", nil];
+      return [NSArray arrayWithObjects:@"gmodel",@"gorm", @"gsmarkup", @"nib", nil];
     }
   else if ([key isEqualToString:PCImages])
     {
Index: Framework/PCFileManager.m
===================================================================
--- Framework/PCFileManager.m	(revision 26126)
+++ Framework/PCFileManager.m	(working copy)
@@ -522,6 +522,11 @@
       isDir = NO;
     }
     
+else if ([[filename pathExtension] isEqualToString:@"nib"])
+    {
+      isDir = NO;
+    }
+
   if (sender == addFilesPanel && !isDir)
     {
       project = [projectManager activeProject];