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Problem implementing sprites

ProllyTooDumb

Hey guys!

I'm using the grf extractor to unpack data.grf and then I start replacing sprites here and there. My problem is - when I repack the .grf, my Ragnarok will no longer start.
In fact, I can just unpack and re-pack the data.grf file without changing ANYTHING and it will actually shrink a little in file size and then it no longer works with Ragnarok. I suppose I'm just screwing up somewhere.

Any ideas on what might be wrong?
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