Comment 2 for bug 1844136

User Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:68.0) Gecko/20100101 Firefox/68.0

Steps to reproduce:

I sent a windows shell command (to be precise using the VBA command "shell"):
C:\Program Files (x86)\Mozilla Thunderbird\Thunderbird.exe -compose "<email address hidden>',cc='',subject='mysubject',body='Dear Mr Test',attachment='C:\test.txt' "

Actual results:

Thunderbird opens. A new Mail is created.
The Mail is completely empty, no TO, not SUBJECT, no BODY - and nothing attached.

If I remove the command line argument "attachment". The Mail opens perfectly normal with TO, SUBJECT and BODY.

Expected results:

The Mail should have been created with TO ("<email address hidden>"), SUBJECT ("mysubject"), BODY ("Dear Mr Test") and the file "test.txt" attached to it.