Gregory's Server
Have you considered including 'magic-bytes' with your ULZ file format?
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The usage of it would be —
If someone doesn't know what the file-name is, they could still determine the type of the file.
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It could be something as simple as the first by 7 bytes of the file format being:
55 4C 5A 2F 31 0D 0A
Which, if interpreted as ASCII or Unicode UTF-8 would be:
"ULZ/1\r\n"
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Here are magic bytes for other file formats:
https://en.wikipedia.org/wiki/List_of_file_signatures
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@reiver @cancel it will be used as parts of other formats, which might have identifiers yes :)