SolidWorks File Types Explained: What They Are and Why They Matter

Core SolidWorks File Types

.SLDPRT – Part File

This is the standard file format for SolidWorks part models. It contains 3D geometry, features, sketches, materials, and custom properties. Whether you’re designing a bolt or a complex housing, your base geometry is stored in this format.

.SLDASM – Assembly File

Assembly files reference multiple part files and define how components are mated together. They don’t store geometry directly but rely on links to the parts they contain. This makes managing references critical.

.SLDDRW – Drawing File

Drawing files generate 2D documentation for parts and assemblies. They include views, dimensions, annotations, and BOMs. Drawings are linked to the models they represent, so changes in the model automatically reflect in the drawing—if the references are maintained.

Supporting and Configuration Files

.SLDTMPL, .ASMTMPL, .DRWTMPL – Template Files

Used for creating standardized documents with pre-set units, title blocks, drafting standards, and custom properties. Templates help ensure consistency across teams and projects.

.SLDLFP – Library Feature Part

These are commonly used for shared features like gussets, weldments, or mounting holes. Stored in a design library, they can be dragged into part files.

.SLDSFFVT – Surface Finish Symbol File

Used in drawings to insert standardized surface finish symbols.

.SLDREG – Settings File

Stores system and interface preferences. Useful for setting up multiple machines with consistent SolidWorks configurations.

Export and Exchange File Formats

To share files outside SolidWorks or with downstream teams like manufacturing or simulation, you’ll often use export formats:

.STEP / .STP

Neutral CAD format widely accepted by nearly all CAD software. Preserves geometry but not features or history.

.IGES / .IGS

Older neutral format, still in use. Better for surfaces than solids.

.Parasolid (.X_T / .X_B)

Developed by Siemens, Parasolid is the underlying kernel for SolidWorks. It’s ideal for geometry transfer when interoperability is needed.

.STL

Used for 3D printing and mesh-based workflows. Triangulates geometry and does not store features.

.PDF / .DWG / .DXF

For 2D sharing and manufacturing. Often used to send drawing views to shops or vendors.

Specialized File Types

.CWR

Stores simulation results from SolidWorks Simulation.

.EPRT / .EASM

eDrawings formats for sharing lightweight, view-only versions of parts and assemblies. Great for collaboration with non-CAD users.

.3MF

Modern 3D printing format with better support for colors and materials than STL.

Managing All These Files: Why Cloud PDM Matters

SolidWorks files are interdependent. A drawing depends on its model. An assembly pulls in dozens or hundreds of linked part files. Lose or rename one, and the whole structure breaks. That is the problem cloud-based Product Data Management (PDM) systems solve.

Sibe is collaboration-first CAD document management with a native SolidWorks add-in. With Sibe you can:

• Keep file references intact when models move or get renamed
• Access your files from anywhere, no VPN and no on-premise server
• Track every version and revision automatically, so no one overwrites someone else's work
• Control access so the right people see the right files
• Open files in any browser without launching SolidWorks, even large assemblies

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In traditional setups, file corruption and reference errors are common due to poor handling or local storage mishaps. Cloud PDM systems eliminate these risks by managing dependencies automatically and providing a structured, traceable environment.

Conclusion

Understanding SolidWorks file types is more than just knowing what each extension means—it’s about understanding how your design data is structured, shared, and protected. As collaboration becomes more distributed and version control more critical, integrating a cloud PDM solution ensures your files stay connected, your team stays aligned, and your projects stay on track.