# Open CAD Files: Identify Formats and Resolve Import Problems

Choose a reader, preserve assembly references, and verify loaded scope before using a CAD model.

Confirm the source application and saving version. PRT can mean NX or Creo; a file extension alone is insufficient. Keep originals unchanged. Native readers depend on version and geometry, and unsupported formats need an export from the authoring application.

## Work through the task

- [How to Open an X_T File Online Without Parasolid Software](https://www.cadprops.com/guides/open-x-t-file-online/index.md)
- [How to Open an IPT File Without Autodesk Inventor](https://www.cadprops.com/guides/open-ipt-without-inventor/index.md)
- [How to Open a CATPart File Without CATIA](https://www.cadprops.com/guides/open-catpart-without-catia/index.md)
- [How to Open an SLDPRT File Without SolidWorks](https://www.cadprops.com/guides/open-sldprt-without-solidworks/index.md)
- [How to Open an SLDASM File Without SolidWorks](https://www.cadprops.com/guides/open-sldasm-without-solidworks/index.md)
- [How to Open an NX PRT File Without Siemens NX](https://www.cadprops.com/guides/open-nx-prt-without-nx/index.md)

## Use the matching tool

- [solidworks viewer](https://www.cadprops.com/tools/solidworks-viewer/index.md)
- [catia viewer](https://www.cadprops.com/tools/catia-viewer/index.md)
- [nx viewer](https://www.cadprops.com/tools/nx-viewer/index.md)

## Before accepting the result

Read warnings, confirm one known dimension and preserve units and scope. Files are processed on the server; see [privacy](https://www.cadprops.com/privacy/index.md) and [accuracy](https://www.cadprops.com/accuracy/index.md). [Browse all guides](https://www.cadprops.com/guides/index.md).

HTML page: https://www.cadprops.com/workflows/open-cad-files/