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--- rhino:filepreviewsmissing [2018/05/03]
+++ rhino:filepreviewsmissing [2021/05/04]
dale [1. Repair your Rhino installation]
@@ Line 1: / Line 1: @@
+====== Previews of Rhino files missing in Windows Explorer ======
+> **Summary:** //How to make sure the Rhino thumbnail viewer is registered in Windows//
+If you do not see preview thumbnails of Rhino .3dm files in Windows Explorer, the follow these steps.
+=====1. Repair your Rhino installation=====
+  - Click **Start -> Settings -> Apps & features**.
+  - For **Rhino 7**:
+    - Select **Rhino 7** and click **Modify**.
+    - In the installation dialog box, click **Repair**.
+  - For **Rhino 6**:
+    - Select **Rhino 6** and click **Modify**.
+    - In the installation dialog box, click **Repair**.
+  - For **Rhino 5**:
+    - Select **Rhinoceros 5 (64-bit)** and click **Modify**.
+    - In the installation dialog box, click **Repair**.
+If you do not see preview thumbnails of Rhino .3dm files, proceed to step 2.
+=====2. Verify thumbnails are not disabled=====
+  - Open **Explorer**.
+  - Click **View**.
+  - Click **Options** and then **Change folder and search options**.
+  - Verify **Always show icons, never thumbnails** is NOT checked.
+{{:rhino:folder_options.png|Folder Options}}
+If you do not see preview thumbnails of Rhino .3dm files, proceed to step 3.
+=====3. Delete the thumbnail cache=====
+If you are running an older Windows, like Windows 7, you may need to run Windows **Disk Cleanup** utility.
+  - Run **Disk Cleanup**.
+  - Click **Thumbnails**.
+  - Click **OK**.
+{{:rhino:disk_cleanup.png|Disk Cleanup}}
+If you do not see preview thumbnails of Rhino .3dm files, proceed to step 4.
+=====4. Register the Rhino thumbnail viewer=====
+To register the Rhino thumbnail viewer, you will need to open a Command Prompt as an Administrator.
+===Windows 8 or 10===
+To open a Command Prompt as Administrator on Windows 8 or 10:
+  - Access by Power menu by pressing **Windows+X**
+  - From the menu, select **Command Prompt (Admin)**
+{{:rhino:window_x.png|Power Users menu}}
+When you launch the Command Prompt with Admin privileges, you’ll likely see a **User Account Control** window asking for permission to continue. Go ahead and click **Yes**.
+===Windows 7===
+To open a Command Prompt as Administrator on Windows 7:
+  - Click Start
+  - In the search field, enter **CMD**.
+  - In the results list, you will see **CMD**.
+  - Right-click on **CMD** and from the context menu, select **Run as Administrator**.
+{{:rhino:window_7.png|Command Prompt}}
+When you launch the Command Prompt with Admin privileges, you’ll likely see a **User Account Control** window asking for permission to continue. Go ahead and click **Yes**.
+====Register the Rhino Thumbnail Viewer====
+===Rhino 6 for Windows===
+If you have Rhino 6 for Windows installed, then run the following command from the Command Prompt window you just opened:
+  regsvr32 "C:\Program Files\Rhino 6\System\RhinoHandlers.dll"
+===Rhino 5 for Windows===
+If you have Rhino 5 for Windows (and you don't have Rhino 6 for Windows installed), then run the following command from the Command Prompt window you just opened:
+  regsvr32 "C:\Program Files\Rhinoceros 5 (64-bit)\System\RhinoHandlers.dll"

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