What is the full folder path that you are storing the CAD files in when you are trying to run the Plastics solver? have you tried copying these CAD files into a higher level folder such as a folder directly off the root C-drive (i.e. C:\CAD Simulations\)?
In the past the maximum supported file length was 260 characters (256 usable after the drive characters and termination character). In Windows 10 long file name support can be enabled which allows file names up to 32,767 characters (although you lose a few characters for mandatory characters that are part of the name). To enable this perform the following:
This can also be enabled via Group Policy via Computer Configuration > Administrative Templates > System > Filesystem > Enable NTFS long paths.
Only perform these steps if you are familiar with registry modifications an incorrect registry modification may put your system in unusable state. My suggestion would be to consult with your IT department before performing these steps or you can try the solution provided by Ryan Dark , that would also resolve your issue.
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