[clingbang]

A simple method is to put all your files in a tar archive on your Win10 machine.
Winzip, WinRAR, 7-Zip etc...  are some programs that can do that : https://dailydoseoftech.com/how-to-open-...on-windows
Use a short (max 8 characters) name for your tar file and  put it in your ISO file.
Your can then untar it in the emulated IRIX from the mounted ISO file and install your software.

Oops! Accidentally deleted my last post.
This worked pretty well, but now I'm running out of space on the emulated machine. Is there a way to resize the CHD drive? I tried extracting the raw files, and creating a new CHD of 8gb size using the original files but IRIX still sees it as being 2gb total, which is way too small.