I remember seeing a highly upvoted answer here stating that sometimes the server log files "fail to decompress" when using the highest compression level in 7-Zip.
Can this happen if 7-Zip doesn't give any errors during the compression phase?
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user198350
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This is the answer, **false recollection**: https://superuser.com/a/619924/598527 – user198350 May 28 '17 at 10:28
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I could find nothing on the web related to 7-Zip's ultra compression being buggy.
If a 7-Zip archive cannot be extracted, it would most likely be due to file corruption after the archive was created.
However, if an archived data is important, you should always test decompression before deleting the originals.
Keltari
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As stated by OP above this answer is correct in that this is not a "bug" in 7-zip. It is due to the fact that 7-zip is able to create archives that can be opened but not extracted by built-in Windows "zip folder" tools due to it using more advance compression algorithms. There is no corruption occurring at all and opening the archive with newer tools would work fine. Related: http://chat.stackexchange.com/transcript/message/35719205#35719205 – Mokubai May 28 '17 at 13:59