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CAD tip CAD tip # 8056:

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A
Trying to open (import) a .OBJ scene into the Autodesk 123D application, it displays a warning sign and the error: "Input string was not in a correct format".

The problem may be in the decimal number delimiter on non-English operating systems (locale). Either change your Windows settings - set the decimal delimiter from comma (",") to point ("."), or edit your OBJ file (e.g. in Notepad) and globally replace all point characters with commas.
123D
100% *CAD
23.6.2011    17846×  
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applies to: 123D ·

See also:
Tip 14620:Converting object data (OD) to XData (XD) in AutoCAD Map 3D.
Tip 14613:How to set the elevation of objects according to the value of Object Data, OD? (OD2Z)
Tip 14526:How to export geometry from AutoCAD DWGs to JSON files and import it back?
Tip 14472:Overview of CAD formats supported in Inventor 2026 (import/export/AnyCAD).
Tip 14367:What CAD formats are supported in the free Personal (hobby) license of Autodesk Fusion?
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