Applications crash when adding files: Exception code: 0xc0000005

I get the same error from at least 3 different applications when I try to "Add files" to the app: Faulting application name: mkvtoolnix-gui.exe, version: 8.6.1.0, time stamp: 0xa6d0a6c8 Faulting module name: ntdll.dll, version: 6.1.7601.19045, time stamp: 0x56259295 Exception code: 0xc0000005 Fault offset: 0x000000000004ac04 Faulting process id: 0x414 Faulting application start time:...