You should use Per Project Audio Folders-setting to have the project file and its audio in the same folder.
I wouldn't be surprised if its practically the same in other DAWs. Bun-files are known to be vulnerable.
Did you really use "+" in the file name, or is it just there for clarification? Such symbols might make the filename unusable. OTOH, I have used "+" in file names (in doc-files) in Windows without problems.