Selecting binary resource as source to QTextBrowser corrupts .ui file

1. Add QTextBrowser to layout
2. In properties, scroll down to "source" and click "select resource"
3. Select binary file (in my case it was a large .PNG that I selected by mistake)
4. [Note: random hieroglyphs appear in the browser]
5. Save and exit
6. Open project and .ui file again. The following error shows in dialogue: An error has occurred while reading the UI file at line 166, column 0: Premature end of document.