I have added a "send attachment" entry to my right-click context menu when I perform that action on files. Adding attachments to emails was always sort of a burden for me because it was really uncomfortable to open the mail program, click on the attachment button and browse to the file on the hard drive of the computer.
While some programs support drag and drop, it means that I have to open the system's file explorer first, browse to the directory the file is in, to finally drag and drop it to the email that I'm writing.
A far better way is to right-click the file and select an entry that would automatically open the email program. All that was left to do from this point on was to fill out the email address and compose the mail.
I only found information to add the "send attachment" entry to the right-click menu for Thunderbird and Outlook.
Both require almost the same steps, only the command that is used will be different:
"Path to Outlook.exe" /a "%1"
"Path to Thunderbird.exe" -compose attachment="file://%1".
My command looks like the following to give you an impression
"C:\Program Files\Mozilla Thunderbird\Thunderbird.exe" -compose attachment="file://%1"
Update: It has become easier to add attachments, as you can now use drag and drop in most email clients and even in online clients to attach files to emails. The command is still working though and if you happen to start in Windows Explorer, it may make the composing of emails with attachments more comfortable to you.
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