🚀 Oh look, it works!

src/preload.js

@@ -0,0 +1,42 @@
+const { remote } = require('electron')
+const fs = require('fs-extra')
+const path = require('path')
+
+const { STATE_PATH, getState } = require('./state')
+
+window.windows95 = {
+  STATE_PATH,
+
+  async saveState(state) {
+    return new Promise((resolve) => {
+      if (!window.emulator || !window.emulator.save_state) {
+        return resolve()
+      }
+
+      window.emulator.save_state(async (error, new_state) => {
+        if (error) {
+          console.log(error)
+          return
+        }
+
+        await fs.outputFile(STATE_PATH, Buffer.from(new_state))
+
+        console.log(`Saved state to ${STATE_PATH}`)
+
+        resolve()
+      });
+    })
+  },
+
+  async restoreState() {
+    try {
+      window.emulator.restore_state(getState())
+    } catch (error) {
+      console.log(`Could not read state file. Maybe none exists?`, error)
+    }
+  },
+
+  quit() {
+    remote.app.quit()
+  }
+}