Full Version: File Preview in MacOS

Hi,

I'm using the v5 beta and could have sworn that I read somewhere it supported file preview in MacOS.

Am I going mad?

thanks,
James.

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Hi James, yes thumbnails in finder windows is supported in MoI v5.

Check that it hasn't been turned off in MOI under Options > Import/Export > 3DM options > "Write thumbnail preview image" checkbox.

Also you may need to enable the extension in macOS System Settings, under under General > "Login Items & Extensions". There should be an entry there for the v5 app and when you click the circle with an "i" in it there should be a switch that you can turn on.

- Michael

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Hi,

They are all enabled.

Does it only work for files saved using the 5 beta?

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it doesn't work for me at all (files saved with v4 or v5beta).

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Hi James,

re:
> Does it only work for files saved using the 5 beta?

Yes saving the embedded thumbnail image is new in version 5.

3DM Files saved with version 4 won't have that.

- Michael

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Hi James,

re:
> it doesn't work for me at all (files saved with v4 or v5beta).

What version of macOS are you using?

Do you have other programs installed that also handle .3dm files?

- Michael

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Hi,

I'm on Tahoe 26.6.2.

Installed are:
MOI v4
MOI v5 beta
Trice (viewer only)

I have have just deleted it. Nothing has changed so I will also re-install MOI and see what happens. Will report back



edit: Made no difference.

By the way, this is the command I needed to run the app:
"sudo xattr -cr /Applications/MoI\ v5\ beta\ Apr-27-2026.app"

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Hi Michael.

I can confirm this feature doesn't work for me either. [I wished it did!]

I'm on Sequoia 15.7.7
Mac mini M4 etc.

Tried using Trice but thought it was a waste of time as MacOS displays STL files in Quicklook fine without it.

Trice wouldn't work with 3DM files. Maybe it would work with Rhino, but I don't use Rhino.

OT: cmd-S working great though!

~Tom

Image Attachments:
Screenshot 2026-08-31 at 15.55.22.jpg 

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