Quark.jar -
It looks like you're referring to Quark, the cross-platform Java tool used as a PC client for the Goldleaf homebrew application on Nintendo Switch.
1. Analyzing a JAR File (The info command)
Before optimizing, understand what you are dealing with. quark.jar
Quality of Life: Adds a "search" bar to your inventory and the ability to "reach" further when placing blocks. How to use the .jar file It looks like you're referring to Quark ,
Quark won't open · Issue #397 · XorTroll/Goldleaf - GitHub Runtime and performance considerations
Open Zadig on your PC while the Switch is connected in Goldleaf's USB mode.
- Runtime and performance considerations