Victor, see attachment for an error message when opening larger model (~300,000 nodes) by double clicking on the file itself. If I open Mecway first (blank) and use file -> open -> select the same file, it opens fine.
I just tried "open with" option by right clicking to select the executable Mecway versions x64 and then x86 (see attachments). Both gave me the same error message. So this is not the case.
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It also reveals a more longstanding bug - it crashes when you turn on the display of node or element numbers for large meshes.