diff --git a/src/lib/backup/compat/legacy-chords.ts b/src/lib/backup/compat/legacy-chords.ts
index 1825d4f8..7ab3afc1 100644
--- a/src/lib/backup/compat/legacy-chords.ts
+++ b/src/lib/backup/compat/legacy-chords.ts
@@ -1,6 +1,8 @@
 import {KEYMAP_IDS} from "$lib/serial/keymap-codes"
 import type {CharaChordFile} from "$lib/share/chara-file"
 
+const SPECIAL_KEYS = new Map<string, string>([[" ", "SPACE"]])
+
 export function csvChordsToJson(csv: string): CharaChordFile {
   return {
     charaVersion: 1,
@@ -9,18 +11,18 @@ export function csvChordsToJson(csv: string): CharaChordFile {
       .trim()
       .split("\n")
       .map(line => {
-        const [input, output] = line.split(",", 2)
+        const [input, output] = line.split(/,(?=[^,]*$)/, 2)
         return [
           input.split("+").map(it => KEYMAP_IDS.get(it.trim())?.code ?? 0),
           output
             .trim()
             .split("")
-            .map(it => KEYMAP_IDS.get(it)?.code ?? 0),
+            .map(it => KEYMAP_IDS.get(SPECIAL_KEYS.get(it) ?? it)?.code ?? 0),
         ]
       }),
   }
 }
 
 export function isCsvChords(csv: string): boolean {
-  return /^([^+, ]+( *\+ *[^+, ]+)* *, *[^+, ]+ *(\n|(?=$)))+$/.test(csv)
+  return /^([^+]+( *\+ *[^+]+)* *, *[^+, ]+ *(\n|(?=$)))+$/.test(csv)
 }