I didn't have any issue opening your file in Mecway version 4.0. Tried on my desktop that has Windows 7 and also my laptop that has Windows 10. See attachments.
this is the error i get. but if you hit ok it does import. the model was just very small and you had to re-zoom to see it. a beta version of Mecway was giving a different error and crashing. i thought both programs were crashing, but only the beta version was. do you get an error pop-up in v4 when you import the file?
There a pop-up window asking for the unit. I see this for both on Windows 7 and 10 64-bit. See attachments for a few screenshots of each step importing the file so you can see what I see.
It turns out this problem happens with File->Import but works OK with File->Open which VMH used. This is a bug and thanks for finding it prop_design. As a workaround, you could open it, then save as .liml, then import into another model.
There's a further bug. Opening .vol files through File->Open or ->Import scales the dimensions wrong. They're scaled down by 1000. Please use the Netgen .vol format with care until version 5 where it'll be fixed.
Comments
I didn't have any issue opening your file in Mecway version 4.0. Tried on my desktop that has Windows 7 and also my laptop that has Windows 10. See attachments.
i guess this is just local to me, not sure why.