7-zip shows cannot open file as archive error.
It sounds like the duplicate of bug #1237 (7-Zip 9.22 can't extract some NSIS archives) or #617 (extract nsis package bug). However, #617 involves a case of files with same name in different folder of the NSIS package, and bug #1237 was listed as open-wont-fix over changed bzip2 method. The only clue over the change is in the release note of NSIS 2.0 Release Candidate 3, where some bugs with LZMA/bzip2 and non-solid compression were fixed.
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