AjaxFileUpload failed to upload AI (Adobe Illustration) file?

[mykltham]

The AJAX Control Toolkit <VERSION>

v20.1.0

The installation method

• [X] NuGet package

Minimal steps to reproduce the bug

1. Add AjaxFileUpload Control,
2. Upload a .AI file

Actual result

the control said Upload error (Application/Postscript)

Expected result

Upload successful

Browser(s) used

Brave, Chrome, Edge

A site deployment method

[X] IIS