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What was the location of this file e.g. (C:\windows\system32\infected-file-name.xxx) ?

Also see, (Mini Sticky) False Positives, how to report and what to do to exclude them until the problem is corrected.

Since a number of other AVs also detect it as either suspicious or another malware name, I have to wonder, perhaps it is the nature of key generators. These are often downloaded from dubious sites (why you might want download a key generator ?) and frequently come with an unwanted gift/trojan.

As you say “Is anyone from Avast interested to analyse the (dodgy) file, or is it unimportant?” perhaps you need to find what it came with.