Arduino IDE won't start if installed under a path that contains ;

[per1234]

Using Arduino IDE Beta Build 61 and Arduino IDE 1.8.6 Hourly Build 2018/05/28 09:33 under Windows 10 64 bit

Install the Arduino IDE under a folder that contains ;.
Start the Arduino IDE. It fails:

C:\foo;bar\arduino-PR-beta1.9-BUILD-61>arduino_debug
Error occurred during initialization of VM
Unable to load native library: C:\foo;bar\arduino-PR-beta1.9-BUILD-61\java\lib\ext;C:\WINDOWS\Sun\Java\lib\ext

[facchinm]

😳 wow, this looks like it's there from the beginning of times and no one ever noticed it.
Solving this might involve patching launch4j