> ## Documentation Index
> Fetch the complete documentation index at: https://docs.ntop.com/llms.txt
> Use this file to discover all available pages before exploring further.

# File Unsupported

## File Unsupported

### About the error

**Issue:** The specified file is not supported. This can happen when the authoring CAD system is newer than what nTop supports or when it is non-commercial.

**Applies to:**

* Import Part

**Cause:**

* There are two reasons this error may occur when loading a native CAD file format.
* nTop does not yet support the version of the CAD system that produced the file.
* The file was authored in a non-commercial version of one of our supported CAD systems, e.g., SOLIDWORKS Education Edition.

**Solution:**

* Export the file from your CAD system in an earlier, supported version of the native CAD file format, if available.
* Export the file from your CAD system as a Parasolid model (`.x_t` or `.x_b`) instead.
* Export the file from your CAD system as a STEP model (`.step` or `.stp`) instead.
* For a list of formats supported by this release of nTop, see [Import and Export](/file_types/import_export).

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