# Path Extension ?

This wildcard is substituted with the file extension, in a given file path.

The wildcard is used in the following way: 

* {path.extension.?}
* For the following input (?) --> c:\Users\Administrator\Pictures\helmut-IO.ico
* The output is going to be --> ico

{% hint style="info" %}
Ensure that the render node or server has access to the file. If the wildcard is present in a server-side stream, the stream's container must have access to the file path.
{% endhint %}


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# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.helmut.de/helmut4-releases/v4.7.1/helmut4-components/streamdesigner/wildcards/path-related-wildcards-9/path-extension.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.