TYPO3 Core

When downloading an extension as t3x from EM, the generated file is corrupted and cannot be imported again. It fails with:

Wrong file format. No data recognized, Error: MD5 mismatch. Maybe the extension file was downloaded and saved as a text file by the browser and thereby corrupted!? (Always select "All" filetype when saving extensions).

t3x was tried to be imported again into same TYPO3 install and into a TYPO3 4.4. Both fail.

I generated a t3x both with 4.5.1-dev or trunk (rev. 10521) and with a 4.5.0 and there is an obvious difference in files as the one from trunk starts with 4 (four) line breaks (char 10) before showing the MD5 hash and the two colons. There are other changes in the compressed array but I guess fixing this obvious bug might solve the whole.
(issue imported from #M17701)