> For the complete documentation index, see [llms.txt](https://docs.apryse.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.apryse.com/web/get-started/faq/mime-types.md).

# MIME types

If you see a 404 for files on your server but you're very sure that the files are there then you may need to set MIME types for certain file extensions used by WebViewer.

If you see a 404 for files on your server but you're very sure that the files are there then you may need to set MIME types for certain file extensions used by WebViewer. With IIS you will generally need to do this and the process may vary slightly depending on your server.

Regardless of the documents that you're loading you'll need to add the MIME type for json files (`application/json`) so that the UI text is loaded. If you see buttons or labels in the UI with names like `controlbar.fullScreen` then that means the json file wasn't loaded successfully.

## XOD

You'll need to add `xod` with a MIME type of `application/octet-stream` or `application/vnd.ms-xpsdocument`

## PDF and Office

| Extension | MIME Type                |
| --------- | ------------------------ |
| res       | application/octet-stream |
| mem       | application/octet-stream |
| wasm      | application/wasm         |
| json      | application/json         |


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