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by sethhochberg 526 days ago
It’s a common enough technique that this surely isn’t the only example, but there was discussion here a while back about TeamViewer doing this to detect the presence and version of the client software when clicking a link to open a remote session:

https://news.ycombinator.com/item?id=32165103

In their case, the (shell of a) font file goes a little further and encodes the version of the teamviewer client that installed it