You can use the TextFX plugin:
- TextFX > TextFX Edit > Line up multiple lines by …

Note: This doesn’t work if the file is read only.
http://tomaslind.net/2016/02/18/how-to-align-columns-in-notepad/
Update 2019: Download link from SourceForge
You can use the TextFX plugin:

Note: This doesn’t work if the file is read only.
http://tomaslind.net/2016/02/18/how-to-align-columns-in-notepad/
Update 2019: Download link from SourceForge