# Materials preview icons are not showing in the Library

**URL:** <https://discourse.mcneel.com/t/materials-preview-icons-are-not-showing-in-the-library/133293>\
**Category:** Rhino for Windows\
**Tags:** windows, materials, rhino7\
**Created:** [November 13, 2021, 7:56pm UTC](https://discourse.mcneel.com/t/materials-preview-icons-are-not-showing-in-the-library/133293 "2021-11-13T19:56:03Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![user1012](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/user1012/32/339641_2.png) [@user1012](https://discourse.mcneel.com/u/user1012)\
**Post date:** [November 13, 2021, 7:56pm UTC](https://discourse.mcneel.com/t/materials-preview-icons-are-not-showing-in-the-library/133293/1 "2021-11-13T19:56:03Z")

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![01](https://global.discourse-cdn.com/mcneel/uploads/default/original/4X/f/f/d/ffd891317f240f492d0f8a3a01b0d2f84c4b1ca5.png)  
![02|690x436](upload://q2rkmJhrkJYjCCoQru2E9nNfzMh.pnFor

For some reason the materials in the library are showing without their colors. Do anyone know what should I use to open the materials with in the library so I can see the color of each material instead of seeing Rhino file sign?  
Thanks

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**Author:** ![John\_Brock](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/john_brock/32/476283_2.png) [@John\_Brock](https://discourse.mcneel.com/u/John_Brock)\
**Post date:** [November 13, 2021, 9:11pm UTC](https://discourse.mcneel.com/t/materials-preview-icons-are-not-showing-in-the-library/133293/2 "2021-11-13T21:11:47Z")

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Hi  
Run: “ **TestRestoreLibraryFileAssociations** ” in Rhino.  
That should re-register the thumbnail previewer dll.

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**Author:** ![user1012](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/user1012/32/339641_2.png) [@user1012](https://discourse.mcneel.com/u/user1012)\
**Post date:** [November 13, 2021, 10:22pm UTC](https://discourse.mcneel.com/t/materials-preview-icons-are-not-showing-in-the-library/133293/3 "2021-11-13T22:22:40Z")

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Mr. John I appreciate your help, the problem was solved.

Thank you very much!

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**Author:** ![Aynaz\_Sadeghi](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/aynaz_sadeghi/32/565533_2.png) [@Aynaz\_Sadeghi](https://discourse.mcneel.com/u/Aynaz_Sadeghi)\
**Post date:** [April 8, 2024, 10:03pm UTC](https://discourse.mcneel.com/t/materials-preview-icons-are-not-showing-in-the-library/133293/4 "2024-04-08T22:03:50Z")

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Thanks​:ok\_hand:t2:🙏🏻

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**Author:** ![tim.ulmen](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/tim.ulmen/32/607007_2.png) [@tim.ulmen](https://discourse.mcneel.com/u/tim.ulmen)\
**Post date:** [September 10, 2024, 3:31am UTC](https://discourse.mcneel.com/t/materials-preview-icons-are-not-showing-in-the-library/133293/5 "2024-09-10T03:31:09Z")

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Is there an equivalent for Mac OS?

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**Author:** ![Patric\_Furrer](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/patric_furrer/32/656994_2.png) [@Patric\_Furrer](https://discourse.mcneel.com/u/Patric_Furrer)\
**Post date:** [March 9, 2025, 10:39am UTC](https://discourse.mcneel.com/t/materials-preview-icons-are-not-showing-in-the-library/133293/6 "2025-03-09T10:39:16Z")

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Hi, Ive got the same problem but I am new in Rhino. So how do I RUN “TestRestor…”?