Trying to attach files via command line (Windows 10): >Thunderbird -compose "attachment='C:\TEMP\one.txt'" Works well. Trying to attach files with comma in filename: >Thunderbird -compose "attachment='C:\TEMP\one, two.txt'" Causes error like "File C:\TEMP\one doesn't exists, therefore can't be attached" (translated from Russian). TB uses comma to separate filenames/paths for each attachment, but comma in filename causses problem. How to solve this problem?