I managed to get this to run on linux (mint 21.3 ubuntu based edition).
step 1: install wine
step 2: open terminal and run "winecfg". wait a few minutes for the initial config files to be created.
step 3: install bottles (a sandboxing environment for wine that lets you create multiple separate sandboxes. each being a "bottle")
step 4: run bottles and create a new bottle. name it something appropriate like "RPGM Save Edit". pick "application" when prompted for bottle type.
step 5: in that bottle. click on dependencies. and install "dotnetcoredesktop7". which is the LTS of .NET 7
step 6: go to settings>manage drives (near the bottom) and add a drive D which points at your games folder.
step 7: add shortcut to the exe for RPGMSaveEdit.exe. please now that when you are in the right folder it will not show it, you need to switch from "supported executables" to "all files". because it is using linux gui it is showing supported executables for linux not for windows. however it will work once you pick the exe file
now you just run RPGMSaveEdit.exe. then in the window that opens, you go to D drive (which is actually your games folder) and find the saves for the game you want to edit.