When Telegram Desktop starts, it creates log_startX.txt file in ...\PortableApps\TelegramDesktopPortable\App\Telegram\ directory, where X is 0, 1, 2 etc. These files are not deleted after Telegram Desktop is closed.
Looks like the issue occurs since Telegram Desktop 4.9.1.
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[Fixed] Telegram Desktop produces log file on every launch
August 19, 2023 - 7:36am
#1
[Fixed] Telegram Desktop produces log file on every launch
These will be cleaned up on upgrade. I've updated the launcher to clean old logs on start so a log from your last run is preserved after each run in case you need to analyze it. This will be included with the next release.
Sometimes, the impossible can become possible, if you're awesome!
As of 4.9.2, log files will be removed on launch. This will prevent lots from building up while still giving access to the latest one for troubleshooting purposes.
Sometimes, the impossible can become possible, if you're awesome!