In Settings -> File Types -> add custom extension, when clicking + code writer immediately crashes. This occurs for all file types, and it does not matter if the field is blank or has a valid entry.
Event Viewer Log:
Faulting application name: CodeWriter.exe, version: 0.0.0.0, time stamp: 0x5d5db5fc
Faulting module name: Windows.UI.Xaml.dll, version: 10.0.18362.997, time stamp: 0xe85f9394
Exception code: 0xc000027b
Fault offset: 0x0000000000713500
Faulting process id: 0x3e58
Faulting application start time: 0x01d66c40cd7436d5
Faulting application path: C:\Program Files\WindowsApps\ActiproSoftwareLLC.562882FEEB491_4.1.39.0_x64__24pqs290vpjk0\CodeWriter.exe
Faulting module path: C:\Windows\System32\Windows.UI.Xaml.dll
Report Id: 3346999e-0117-4ac0-a0c5-6552a29591d0
Faulting package full name: ActiproSoftwareLLC.562882FEEB491_4.1.39.0_x64__24pqs290vpjk0
Faulting package-relative application ID: App