I need to run a test which requires that I corrupt a specific .exe file. For security reasons I cannot upload this file to http://corrupt-a-file.net/. Is there a known tool for Windows that I can use, or a recommended technique?
If we define corrupt as not being able to start the executable, just open it with a text editor (like notepad++) and change some text around and save. Some executables might be to large to open, but I think a good text-editor should be able to handle most. Open the executable, if it still works, change more text around :)
The smallest changes will often result in a broken application.
Maybe have a look at the file with a hexeditor and change some of the important bits.