# Handling Untrusted Documents

> Open received files in a Windows Forms TextControl: limit Open dialog formats, catch FilterException, check links in HypertextLinkClicked and redact text.

- **Product:** TX Text Control .NET for Windows Forms
- **Section:** Documentation
- **Kind:** Topic
- **Path:** TX Text Control .NET for Windows Forms > Security > Handling Untrusted Documents
- **Web URL:** https://docs.textcontrol.com/tx-text-control-dotnet-winforms/security/untrusted-documents/
- **LLMs URL:** https://docs.textcontrol.com/tx-text-control-dotnet-winforms/security/untrusted-documents/llms.txt
- **LLMs-Full URL:** https://docs.textcontrol.com/tx-text-control-dotnet-winforms/security/untrusted-documents/llms-full.txt

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## On This Page

- [Accept Only the Formats You Need](https://docs.textcontrol.com/tx-text-control-dotnet-winforms/security/untrusted-documents/#accept-only-the-formats-you-need)
- [Handle Files That Don't Load](https://docs.textcontrol.com/tx-text-control-dotnet-winforms/security/untrusted-documents/#handle-files-that-don-t-load)
- [Decide What a Link Opens](https://docs.textcontrol.com/tx-text-control-dotnet-winforms/security/untrusted-documents/#decide-what-a-link-opens)
- [Keep File References in One Folder](https://docs.textcontrol.com/tx-text-control-dotnet-winforms/security/untrusted-documents/#keep-file-references-in-one-folder)
- [Check Hidden Content Before Passing a Document On](https://docs.textcontrol.com/tx-text-control-dotnet-winforms/security/untrusted-documents/#check-hidden-content-before-passing-a-document-on)
- [Redact Text](https://docs.textcontrol.com/tx-text-control-dotnet-winforms/security/untrusted-documents/#redact-text)
- [Next Steps](https://docs.textcontrol.com/tx-text-control-dotnet-winforms/security/untrusted-documents/#next-steps)

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## Nearby

- **Previous:** [Document Protection and User Permissions](https://docs.textcontrol.com/tx-text-control-dotnet-winforms/security/document-protection/llms.txt)
- **Next:** [PDF Passwords and Permissions](https://docs.textcontrol.com/tx-text-control-dotnet-winforms/security/pdf-passwords/llms.txt)