# ONNX025: external-tensor-not-file

**Code:** `ONNX025`

**Name:** `external-tensor-not-file`

**Severity:** error

**Category:** spec

**Target:** value

**Fixable:** No

## Message

External tensor path is not a regular file.

## Suggestion

Ensure the external tensor path points to a regular file, not a directory or symlink.

## Details

External tensor data must be stored in a regular file. Directories,
symlinks, or other special file types are not valid.