AecProject45.arx Autodesk Architectural Desktop 2005; Windows XP Professional, Windows XP Home, Windows XP Tablet PC, Windows 2000 Autodesk Building Systems 2005; Windows XP Professional, Windows XP Home, Windows XP Tablet PC, Windows 2000 Defect #550541 If multiple users make simultaneous modifications to a project, the Sheet Set Template (.dst) can become corrupt and file is reduced to 0 KB in size. The updated version of the AecProject45.arx file addresses this issue and prevents future instances of this problem. Use the following process to install the updated AecProject45.arx file: 1. Verify that Service Pack 1 for Autodesk Architectural Desktop 2005 (or Service Pack 2 for Autodesk Building Systems 2005) has already been installed. Do not proceed with this process until the required service pack has been installed. 2. Exit all sessions of Autodesk Architectural Desktop 2005 or Autodesk Building Systems 2005. 3. Download the AecProject45.zip file and extract the updated AecProject45.arx file to a temporary location. 4. Open Windows Explorer and navigate to the "C:\Program Files\Autodesk Architectural Desktop 2005" directory. 5. Rename the existing version of the AecProject45.arx file to AecProject45.old. 6. Copy the new version of the AecProject45.arx file to the "C:\Program Files\Autodesk Architectural Desktop 2005" directory. NOTE: If you are working with Autodesk Building Systems, the AecProject45.arx file will be located in the "C:\Program Files\Autodesk Building Systems 2005" directory.