From cabcf4afe6a4988679d8e3a52ec18d802210fdba Mon Sep 17 00:00:00 2001
From: Alex Shvartzkop <dudesuchamazing@gmail.com>
Date: Mon, 21 Aug 2023 19:22:20 +0300
Subject: [PATCH] Altium: better message when importing unsupported format
 versions.

Fixes https://gitlab.com/kicad/code/kicad/-/issues/15465
---
 pcbnew/plugins/altium/altium_pcb.cpp | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/pcbnew/plugins/altium/altium_pcb.cpp b/pcbnew/plugins/altium/altium_pcb.cpp
index 198525c225..8484c01d96 100644
--- a/pcbnew/plugins/altium/altium_pcb.cpp
+++ b/pcbnew/plugins/altium/altium_pcb.cpp
@@ -450,6 +450,23 @@ void ALTIUM_PCB::Parse( const ALTIUM_COMPOUND_FILE&                  altiumPcbFi
         }
     }
 
+    const auto& boardDirectory = aFileMapping.find( ALTIUM_PCB_DIR::BOARD6 );
+
+    if( boardDirectory != aFileMapping.end() )
+    {
+        std::vector<std::string> mappedFile{ boardDirectory->second, "Data" };
+
+        const CFB::COMPOUND_FILE_ENTRY* file = altiumPcbFile.FindStream( mappedFile );
+
+        if( !file )
+        {
+            THROW_IO_ERROR( _(
+                    "This file does not appear to be in a valid PCB Binary Version 6.0 format. In "
+                    "Altium Designer, "
+                    "make sure to save as \"PCB Binary Files (*.PcbDoc)\"." ) );
+        }
+    }
+
     // Parse data in specified order
     for( const std::tuple<bool, ALTIUM_PCB_DIR, PARSE_FUNCTION_POINTER_fp>& cur : parserOrder )
     {