[shrek]

Huh, well it should work then. First go to https://www.mamedev.org/oldrel.html and download mame0207b_64bit.exe. You'll need the IRIX 6.2 disk image that dexter1 uploaded here https://tudl1910.home.xs4all.nl/Indy_emu...irix62.chd and go to http://cominf0.narod.ru/mess123.htm and Ctrl+F to search for ip225015. Take ip225015.zip and stick it in the "roms" folder, but don't unzip it. Put the IRIX disk image into the MAME folder. After you run that, just go into the MAME folder and up to File > PowerShell > Run as admin and a terminal window will open. Enter "./mame64 ip225015.bin -hard1 irix62.chd" to start the emulated Indy. Click on "stop for maintenance" and go to command monitor. Enter "setenv -f eaddr 08:00:69:12:34:56" or else IRIX will just spit out errors on boot. MAME keyboard shortcuts don't seem to work, so to exit the machine you Ctrl+Esc which brings up the start menu. Then you hover over MAME in the taskbar and close it with the X in the corner of the tile. I've done this like 30 times and it won't corrupt the disk image. 

I'm going to guess that the issue you're having is related to the MAME GUI. I haven't been able to navigate it very well. Just use the command line to start the emulator.