http://cutesoft.net/developer+guide/Restricting-Document-Files-by-Extensions-and-Types.htm
Restricting Document Files by Extensions and Types
One of the Cute Editor new and innovative capabilities is Restricting uploading document Files by Extensions and Types. You can filter the type of document files so only specified file types are allowed to upload or show in the dialog.
This topic describes how to manage uploading document file type restrictions.
You can restrict uploading document Files by Extensions and Types by editing the security policy file:
The security policy file (default.config, admin.config and guest.config) can be found in the /CuteEditor/Configuration/Security folder. In security policy file you can find the DocumentFilters element element . By default, it contains the following value:
<
security name="DocumentFilters">
<item>.pdf</item>
<item>.zip</item>
<item>.rar</item>
</security>
You can modify the DocumentFilters element element to meet your own requirements.
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