I-deas drafting

Hello everyone,
I have thousand of files with DWG extension created with I-deas. I can not open them because I dont have this software and i can not find anywhere a viewer or something like that. Can anyone help me to how open and visualize those drawings?
Best regards,
Xabier
Accepted answer
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Autodesk offers an online viewer and for download TrueView for free
https://www.autodesk.com/products/dwg/viewers
There are also free trials available from Autodesk
https://www.autodesk.com/free-trials