The answer: yes, I think investors love to double-click an attachment, but they should not be doing it because they gave up on reading the uninspiring cover letter.
Many cold investor emails make a couple of mistakes:
- Non-descriptive subject line
- A cover letter in the body text that is far to long, full of buzzwords, and vague about what next step you actually want
- As an attachment, the full investor presentation, or maybe even the full business plan
Remember what your objective of a cold investor email is: not landing the investment, but creating the opening for the next interaction (probably a phone call). So:
- Use the space you have in the subject line to make sure your email gets opened ([x] suggested I contact you
- Write a very short and to the point "cover letter" (a few sentences) in which you explain what you and hint at why it is a great business opportunity. Ask what you want to achieve (a phone call?)
- Attach a few highly visual slides that focus on what would normally be the opening of your full investor presentation: a rough description what you do, a reminder of the pain you are trying to solve, and the brilliant solution.