The following error appears during the step "Update files" when choosing ".tar.bz2" as archive type and pressing the download button:

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Information

Unable to open file ./../store/update_3.0.B3_to_3.0.B4.tar.bz2 [bzopen - wb]
Time : 1164668642.504s | 5 Queries | GZIP : Off

".tar", ".tar.gz" and ".zip" however works as expected.

I'm running PHP 5.2.0-pl0-gentoo on a linux system.