diff --git a/audiogame-manager.sh b/audiogame-manager.sh
index 1ea4261..9aa1a1a 100755
--- a/audiogame-manager.sh
+++ b/audiogame-manager.sh
@@ -286,15 +286,15 @@ echo "Loading documentation, please wait..."
     # Try to find documentation based on common naming conventions.
     local gamePath="$(winepath -u "$2" 2> /dev/null)"
     gamePath="${gamePath%/*}"
-    local gameDoc="$(find "$gamePath" -type f -iname 'user_manual.html' | head -1)"
+    local gameDoc="$(find "$gamePath" -type f -iname 'user_manual.html' -or -iname 'user_manual.htm' | head -1)"
     if [[ -z "$gameDoc" ]]; then
-        gameDoc="$(find "$gamePath" -type f -iname 'manual.html' | head -1)"
+        gameDoc="$(find "$gamePath" -type f -iname 'manual.html' -or -iname 'manual.htm' | head -1)"
     fi
     if [[ -z "$gameDoc" ]]; then
-        gameDoc="$(find "$gamePath" -type f -iname 'en.html' | head -1)"
+        gameDoc="$(find "$gamePath" -type f -iname 'en.html' -or -iname 'en.htm' | head -1)"
     fi
     if [[ -z "$gameDoc" ]]; then
-        gameDoc="$(find "$gamePath" -type f -iname 'readme.html' | head -1)"
+        gameDoc="$(find "$gamePath" -type f -iname 'readme.html' -or -iname 'readme.htm' | head -1)"
     fi
     if [[ -z "$gameDoc" ]]; then
         gameDoc="$(find "$gamePath" -type f -iname 'manual.txt' | head -1)"