What he said.

It allows you to (for example) do a bunch of calculations, save the 
result to a file, and load it back in during the next frame of the 
animation.

POV-Ray doesn't have the ability to read arbitrary files. Nor to write 
them, really. (It can write arbitrary text files. But it can't read them 
back.)

If you wanted, I suppose you could write some kind of preprocessor which 
sticks quote marks round everything first...

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