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Yes, and it will just use content-disposition with the correct mimetype to encourage it to be saved locally or opened by the relevant handler programme according to your system preferences.
However... we are renaming the files.
We rename the files as file names could be unicode, etc and we don't know what is safe to use on whatever file system you're saving the file to. We could try and map file names to whatever is the safe set, but ultimately that would look like a Windows 8.3 file name from a FAT file system... we'd screw up the vast majority of file names anyway. So we went for a very safe and highly consistent thing... the SHA1 hash of the file name with the correct file extension.
Can I upload an excel?
Test: