The .txt suffix usually follows the Netscape cookie format , which uses tab-separated values. Which perspective are you interested in exploring further? Cookie-Editor extension - Opera add-ons
Because this file name is commonly associated with tools that , there are two likely interpretations for your request: 1. Malware Analysis or Security Write-up quickcookie-OperaGX.txt
Please clarify: are you asking for a of a suspicious file you found, or a how-to guide for exporting your own cookies? Advanced Scannability: quickcookie-OperaGX.txt
These files are usually stored in AppData\Roaming\Opera Software\Opera GX Stable . quickcookie-OperaGX.txt