Hi wim,

> the files are 357 and 424 Mb big, could that be the problem?

Yes, those are pretty large files and may balloon further than that in memory if they include instanced parts.


> would it eventually open if I waited long enough?

Possibly, but it also may run out of memory. For dealing with large files it can be good to adjust some mesh settings to avoid excessive memory consumption. To do that go to Options > View > "Meshing parameters" and set "Mesh angle" to 30 degrees and uncheck "Add detail to inflections". That will make for a somewhat rougher and jaggedy looking shaded surface display but it will also conserve a lot of memory.


> I hope in V4 there is a better activity indication when opening files.

Yes, it's definitely something that I want to improve. Currently MoI is not very optimized for the case of dealing with very large imported files, it's still more focused on it's main initial goal of constructing models yourself.

- Michael