Others have already explained what your file is, that it is not an ''RFC'' (Request For Comment - a sort of pre-name for pseudo-standard file types - but that doesn't matter) but it is a ''MSG'' file (the last portion of the file name after the last period). That MSG is an encompassed mail message within your mail message.
And you should be able to double-click the MSG file to open it within your Outlook. But I would be cautious about opening any enclosed attachments in mail messages.
INSTEAD, just Google ''Your Age By Chocolate'' and you will find a LOT of websites that tell you what the 'math trick' is about.
Here it is, for your reading pleasure:
1. Pick the number of times a week that you would like to have chocolate.
(More than once but less than 10)
2. Multiply this number by 2
3. Add 5
4. Multiply it by 50
5. If you have already had your birthday, this year, add 1755.
If you haven't, add 1754
6. Now subtract the four digit year that you were born.
You should have a three digit number.
The first digit of this was your original number (i.e., how many times you want to have chocolate each week).
The next two numbers are?..YOUR AGE! (Oh YES, it is!!!!!)
THIS IS THE ONLY YEAR (2005) IT WILL EVER WORK
Now, a comment from me. There is no real 'magic' to this. It is simple math where you take any single digit and shift it up to the 'hundreds position' and use simple math to subtract this year from the year you were born to arrive at your age in the last two digit positions. Big deal.
The bit about this being the "only year" this is going to work. Well duh, next year you just modify the addtition of the 17xx value by one and that will be the "only year" that will work! yada yada yada.