Where can I find .cdf files for Affymetrix ChIP-chip data analysis?
It looks like it's in GEO here: https://www.ncbi.nlm.nih.gov/geo/query/acc.cgi?acc=GPL10187

There is apparently a zipped copy linked at the bottom in the supplementary files.

When people upload a study based on an array, there is a corresponding 'platform' record where the array details should be deposited.

Edit: you will probably need to gunzip the file first, to get it into CDF format.