Hi Simon, a 1.2 Gb is an extraordinarily large file - currently MoI is a 32-bit program and so it's only able to address around 3GB of RAM. But a file will expand a lot in the memory it consumes at runtime due to things like display meshes and various support structures.
So currently you will not be able to process a file of that very large size. There isn't any specific fixed file size that's the maximum because it depends on a lot of variables about what is specifically in the file, like does it contain a whole bunch of tightly curved pieces that will make a heavy display mesh, or does it contain a lot of instanced data that will then multiply the runtime size as instances are converted into regular standalone objects, etc...
You'd probably need to get that file separated out into something like 4 or 5 separate files, maybe more pieces, before it would be possible to load it into MoI. There are also some settings you can adjust to help load larger files, but 1.2 Gb is still way too big. But the details on the settings are here: http://moi3d.com/forum/index.php?webtag=MOI&msg=5322.2
Currently the focus of MoI is more on making it easy to model simple CAD objects very quickly with a lower learning curve. It's not focused on loading massive files from other CAD systems as of yet, but I've been working on a major rewrite for the next version to make it 64-bit so that it will be able to use all your system RAM instead of only 3GB worth.
If MoI doesn't do what you needed it to, just let me know and I can refund your purchase.
- Michael
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