I am not sure if the file is really gone - the path
creates a folder with the contents of %1 in the root directory of the current drive - so perhaps you have now a folder called c:\bug
I also cannot reproduce a path with 2 \ in the preview if the "new" mask is represented accurately
Just a quick note:
You can format special characters like a backslash or an entire path if you enclose them in backticks `
C:\c_temp\New Bug\\Bug\Bug.mp3
Or you can select the text and click on the </> icon in the mini toolbar for your text:
This way you don't need to write 3 backslashes to get 1 visible backslash here in this forum. This is important for seeing the exact format string and helps with debugging special cases and characters.
You have my incorrect "new" mask correct. If you click the preview button it opens a txt file showing the absolute paths with the double backslash present.