.CSV versus .csv

I'm trying to read in .csv files, but I keep getting an error message (not a .csv file, can't read format, not a supported format). My test data will work if I change .CSV to .csv. Too many files to really do that manually.

I've tried readtable, csvread, and everything else possible. Documentation says that for some of them, file format should be read automatically. But Matlab is not recognizing all caps .CSV. I'm running 64 bit Windows 7.

Any suggestions?

[Image Analyst]

I doubt the case of the extension is the problem. Please attach one of the files that works when it's changed to .csv but not when it's .CSV.