Some features—like headers, footers, and annotations—aren’t supported in WordPad. If you open a file with these features and then save the file in WordPad, you’ll lose the content in these features. If you want to change such a file, but don’t want to lose the original content, tap or click Save as and save the file with a different name. That way you can make changes to a copy of the file while keeping the content in the original file intact.
Headers and footers
Footnotes and endnotes
Glossary document entries
Annotations, including comments, revisions, and bookmarks
Mail merge data fields and instructions
Specific document settings
DrawingML, MathML, and custom XML content in Office Open XML format text documents
Chart content, mathematical content, and graphic content in OpenDocument format text documents
The following will also change:
Multilevel lists will be transformed to single-level bulleted lists but the indentation stays the same.
The background color of a paragraph will be changed to look like the text has been highlighted instead.