This question is not specifically about Cocoa programming but I hope that some 
Mac OS X experts out there can give me an answer.

I sent an attached photo to my daughter so that she could print it out using 
Costco print services.  I sent it at high resolution, the photo image was 1.6 
MB.  It seems that Mac mail changed the resolution to a more web friendly size 
of about 64 K with much reduced resolution.  So, I thought that a way to get 
around this was to change the file type (extension) of the image file to 
something other then .jpg such as .dat (and, I tried .zz, .q, and null).  
However, the file was still recognized and interpreted as a jpeg file and 
treated in the same manner by mail (and, also by the finder that displayed the 
image).

So, it looks like Mac OS X is interpreting the file based on contents and not 
based on file extension.  This seems to be a very wrong thing to do in my 
opinion.  Does anyone know of a way to turn this off or is this considered a 
"feature" for some ease-of-use aspect of OS 
X?_______________________________________________

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