VWX File Documentation

Summary

A Vectorworks Design File (.vwx) is the native document of Vectorworks, the CAD and BIM application used in architecture, landscape design and entertainment (theatre and lighting) design. It is a single proprietary, compressed binary container holding 2D linework, 3D geometry, layers, classes, resources and BIM data, with the generic MIME type application/octet-stream. Only Vectorworks opens a .vwx natively; there is no free standalone viewer. To share it, export from Vectorworks to DWG/DXF, PDF or an image.

Technical details

FeatureValue
Full nameVectorworks Design File
File extension.vwx
MIME typeapplication/octet-stream
Format typeProprietary compressed binary CAD/BIM document
DeveloperVectorworks, Inc. (a Nemetschek Group company)
Introduced2008 (Vectorworks 2008), replacing .mcd
Predecessor format.mcd (MiniCAD / VectorWorks)
Open standardNo — proprietary, not publicly documented
Magic numberNo published constant signature
Contents2D + 3D geometry, design layers, classes, sheet layers, resources, BIM data
Native applicationVectorworks (Windows and macOS)
Version compatibilityUpdated yearly; not forward-compatible (newer file won’t open in older version)
Cloud / mobile viewingVectorworks Cloud Services (web); Nomad app (iOS/Android)
Export targetsDWG, DXF, PDF, IFC, IGES, JPG/PNG (all from within Vectorworks)
Third-party viewerNone — nothing outside Vectorworks reads .vwx natively
Related extensions.mcd, .vwxp, .vwxd, .vwxr, .dwg, .dxf, .ifc
Developer sitevectorworks.net

What is a VWX file?

VWX is the native document format of Vectorworks, a CAD and BIM application from Vectorworks, Inc., part of the Nemetschek Group. The .vwx extension arrived with Vectorworks 2008, replacing the older .mcd extension that dated back to the program’s MiniCAD and VectorWorks origins. Vectorworks is common in architecture, landscape architecture, and entertainment design — theatre, lighting, scenic and event work through its Spotlight product — so a .vwx typically holds a building model, a site or planting plan, or a stage and lighting plot. The MIME type is the generic application/octet-stream, because the format is a single proprietary binary rather than a text or web type.

A .vwx is not an image and not a package you can unzip. It is one proprietary, compressed binary container that bundles the whole project. The format is not publicly documented, and there is no published constant magic number for it, so this article describes the logical model a Vectorworks file organises rather than byte offsets that Vectorworks does not disclose.

Design layers and classes: two independent organisers

Vectorworks organises a drawing along two axes at once, and understanding a .vwx means understanding both. Design layers are the model space: the containers where 2D linework and 3D geometry actually live, usually mapped to storeys or areas of a project (a ground-floor layer, a roof layer, a site layer). Each design layer has its own elevation and scale.

Classes are a second, orthogonal system that controls attributes and visibility — graphic appearance (line weight, fill, colour) and whether a set of objects shows or hides — independent of which design layer an object sits on. A wall on the ground-floor layer might belong to the “Wall-Exterior” class. This is different from the single-axis layer model in some other CAD tools, where one layer list carries both grouping and appearance. In a .vwx, an object records both its design layer and its class, so the same file can be viewed by storey (layers) or by system (classes) without moving anything.

Sheet layers and viewports: the output side

Separate from the design layers where you model, a .vwx also stores sheet layers: the pages prepared for printing and PDF output, at paper scale with title blocks. A sheet layer holds viewports, framed views onto the design-layer model at a chosen scale, projection and class/layer visibility. Because a viewport is a live view onto the model, changing the model updates every sheet that looks at it. This is why exporting a .vwx to PDF is done from a sheet layer — the sheet already carries the scale, the title block and the exact set of visible classes and layers the drawing is meant to present.

Symbols, resources and the resource model

Reusable content in a .vwx lives as resources: symbols (reusable object definitions placed as instances), textures and materials, hatches, line types, plant and lighting library objects, record formats, and more. A symbol is stored once as a definition and then referenced by each placed instance, so a plan with two hundred identical light fixtures stores one fixture definition and two hundred lightweight placements. Render appearance is governed by Renderworks resources — materials, lighting and viewport render styles — also held inside the file. Bundling definitions and instances together in one document is part of why the format is a single opaque binary rather than a folder of parts.

BIM data and IFC mapping

Beyond geometry, a .vwx carries BIM information: objects can hold record data and be mapped to IFC entities, and the file stores worksheets (schedules and quantity take-offs) that report on that data. This is the layer that makes Vectorworks a BIM tool rather than a pure drafting program, and it is why the correct interchange target for architecture is IFC rather than a geometry-only format: exporting to IFC preserves the building data and the object semantics, not just the lines. Geometry-only exchange (DWG/DXF) keeps the drawing but drops most of the BIM meaning.

Yearly versioning and forward incompatibility

The .vwx format is revised with each annual Vectorworks release, and it is not forward-compatible: a file saved in a newer Vectorworks generally will not open in an older one. This is the most common “won’t open” cause among Vectorworks users themselves — a file created in a later version handed to someone still on an earlier version. The fix is on the sender’s side: Vectorworks can export to a previous version (File › Export › Export Vectorworks), producing a .vwx the older release can read. Relatedly, the predecessor MCD format flows only one way: old .mcd files are opened and upgraded into .vwx, never saved back.

Opening a .vwx when you don’t own Vectorworks

Because the format is proprietary and undocumented, only Vectorworks reads a .vwx natively — no other CAD program opens it directly, and there is no legitimate free standalone viewer. Two realistic paths exist for a recipient without the software. The first is Vectorworks’ own cloud tools: upload the file to Vectorworks Cloud Services to view and share it in a browser, or open it in the free Nomad app on an iPad or phone. The second, and usually the more practical, is to ask the sender to export an interchange file: DWG or DXF for editing in another CAD program, IFC for BIM, or PDF and JPG/PNG simply to view and print. Every one of those exports is produced from inside Vectorworks, since nothing else can read the source.

Frequently asked questions

How do I open a VWX file without Vectorworks?

There is no free standalone viewer, because the format is proprietary and only Vectorworks reads it. Upload the file to Vectorworks Cloud Services or open it in the free Nomad app to view it, use a Vectorworks free trial, or ask the sender to export it to DWG/DXF (for CAD) or PDF/image (just to see it).

Why can’t I open a VWX in my older Vectorworks?

The format updates every year and is not forward-compatible, so a file saved in a newer Vectorworks will not open in an older release. Ask the sender to use File › Export › Export Vectorworks to save a copy in your version, or update Vectorworks.

What is the difference between VWX and MCD?

MCD is the older MiniCAD/VectorWorks format; VWX replaced it in Vectorworks 2008. Modern files are .vwx. Old .mcd files can be opened and upgraded into Vectorworks, but the process does not run in reverse.

References