Two-part question here:
1) Not sure if this is possible or not. Perhaps it's even easy, I don't know. Suppose I have a link to a file called "thisisthetext.txt". When a user clicks on the link, I need the browser to open a "Save As" dialog box and NOT read the file in the browser. Unfortunately, changing the file/extension isn't an option for me in this case. It has to stay as is (don't ask why...).
2) This part is bizarre... once you get the browser to open a "Save As" dialog box, is it possible to write a different string to the "File Name" field in the dialog box? I know you're probably thinking "the user can just change it to anything they want", but it's actually not an option in this case.
So, in short, a user clicks on a link to a file called "thisisthetext.txt", a "Save As" dialog box opens up with something like "text123.txt" in the File Name field, and the contents of thisisthetext.txt are stored on the users hard drive as text123.txt.
As far as im aware you could do that by making .txt not a recognised mime type.
How that is done i am not sure but someone will know, probably just have to place a line in the .htaccess file...
I THINK :D