diff --git a/app/src/search/assets.ts b/app/src/search/assets.ts
index 523df96f1..ba0fa56e9 100644
--- a/app/src/search/assets.ts
+++ b/app/src/search/assets.ts
@@ -357,47 +357,35 @@ export const assetMethodMenu = (target: HTMLElement, cb: () => void) => {
     window.siyuan.menus.menu.popup({x: rect.right, y: rect.bottom}, true);
 };
 
+let filterTypes: string[] = [
+    ".txt", ".md", ".markdown", ".docx", ".xlsx", ".pptx", ".json", ".log", ".sql", ".html", ".xml", ".java", ".h", ".c",
+    ".cpp", ".go", ".rs", ".swift", ".kt", ".py", ".php", ".js", ".css", ".ts", ".sh", ".bat", ".cmd", ".ini", ".yaml",
+    ".rst", ".adoc", ".textile", ".opml", ".org", ".wiki",
+]
+
+const filterTypesHTML = (types: string[]) => {
+    filterTypes = filterTypes.sort((a: string, b: string) => {
+        return a.localeCompare(b);
+    });
+
+    let html = "";
+    types.forEach((type: string) => {
+        html += `<label class="fn__flex b3-label">
+        <div class="fn__flex-1 fn__flex-center">
+            ${type}
+        </div>
+        <span class="fn__space"></span>
+        <input class="b3-switch fn__flex-center" data-type="${type}" type="checkbox" checked>
+    </label>`;
+    });
+    return html;
+}
+
 export const assetFilterMenu = (assetsElement: Element) => {
     const localData = window.siyuan.storage[Constants.LOCAL_SEARCHASSET].types;
     const filterDialog = new Dialog({
         title: window.siyuan.languages.type,
-        content: `<div class="b3-dialog__content">
-    <label class="fn__flex b3-label">
-        <div class="fn__flex-1 fn__flex-center">
-            .txt
-        </div>
-        <span class="fn__space"></span>
-        <input class="b3-switch fn__flex-center" data-type=".txt" type="checkbox"${localData[".txt"] ? " checked" : ""}>
-    </label>
-    <label class="fn__flex b3-label">
-        <div class="fn__flex-1 fn__flex-center">
-            .md
-        </div>
-        <span class="fn__space"></span>
-        <input class="b3-switch fn__flex-center" data-type=".md" type="checkbox"${localData[".md"] ? " checked" : ""}>
-    </label>
-    <label class="fn__flex b3-label">
-        <div class="fn__flex-1 fn__flex-center">
-            .docx
-        </div>
-        <span class="fn__space"></span>
-        <input class="b3-switch fn__flex-center" data-type=".docx" type="checkbox"${localData[".docx"] ? " checked" : ""}>
-    </label>
-    <label class="fn__flex b3-label">
-        <div class="fn__flex-1 fn__flex-center">
-            .xlsx
-        </div>
-        <span class="fn__space"></span>
-        <input class="b3-switch fn__flex-center" data-type=".xlsx" type="checkbox"${localData[".xlsx"] ? " checked" : ""}>
-    </label>
-    <label class="fn__flex b3-label">
-        <div class="fn__flex-1 fn__flex-center">
-            .pptx
-        </div>
-        <span class="fn__space"></span>
-        <input class="b3-switch fn__flex-center" data-type=".pptx" type="checkbox"${localData[".pptx"] ? " checked" : ""}>
-    </label>
-</div>
+        content: `<div class="b3-dialog__content">` + filterTypesHTML(filterTypes) + `</div>
 <div class="b3-dialog__action">
     <button class="b3-button b3-button--cancel">${window.siyuan.languages.cancel}</button><div class="fn__space"></div>
     <button class="b3-button b3-button--text">${window.siyuan.languages.confirm}</button>
diff --git a/kernel/model/asset_content.go b/kernel/model/asset_content.go
index a31163f27..ff45540c7 100644
--- a/kernel/model/asset_content.go
+++ b/kernel/model/asset_content.go
@@ -289,7 +289,7 @@ func IndexAssetContent(absPath string) {
 
 	assetsDir := util.GetDataAssetsAbsPath()
 
-	ext := strings.ToLower(filepath.Ext(absPath))
+	ext := filepath.Ext(absPath)
 	parser := assetContentSearcher.GetParser(ext)
 	if nil == parser {
 		return
@@ -360,7 +360,7 @@ func (searcher *AssetsSearcher) GetParser(ext string) AssetParser {
 	searcher.lock.Lock()
 	defer searcher.lock.Unlock()
 
-	return searcher.parsers[ext]
+	return searcher.parsers[strings.ToLower(ext)]
 }
 
 func (searcher *AssetsSearcher) FullIndex() {
@@ -382,7 +382,7 @@ func (searcher *AssetsSearcher) FullIndex() {
 			return nil
 		}
 
-		ext := strings.ToLower(filepath.Ext(absPath))
+		ext := filepath.Ext(absPath)
 		parser := searcher.GetParser(ext)
 		if nil == parser {
 			return nil
@@ -433,9 +433,11 @@ func NewAssetsSearcher() *AssetsSearcher {
 			".c":        txtAssetParser,
 			".cpp":      txtAssetParser,
 			".go":       txtAssetParser,
+			".rs":       txtAssetParser,
 			".swift":    txtAssetParser,
 			".kt":       txtAssetParser,
 			".py":       txtAssetParser,
+			".php":      txtAssetParser,
 			".js":       txtAssetParser,
 			".css":      txtAssetParser,
 			".ts":       txtAssetParser,
@@ -460,6 +462,10 @@ func NewAssetsSearcher() *AssetsSearcher {
 	}
 }
 
+const (
+	TxtAssetContentMaxSize = 1024 * 1024 * 4
+)
+
 type AssetParseResult struct {
 	Path    string
 	Size    int64
@@ -475,7 +481,14 @@ type TxtAssetParser struct {
 }
 
 func (parser *TxtAssetParser) Parse(absPath string) (ret *AssetParseResult) {
-	if !strings.HasSuffix(strings.ToLower(absPath), ".txt") {
+	info, err := os.Stat(absPath)
+	if nil != err {
+		logging.LogErrorf("stat file [%s] failed: %s", absPath, err)
+		return
+	}
+
+	if TxtAssetContentMaxSize < info.Size() {
+		logging.LogWarnf("file [%s] is too large [%s]", absPath, humanize.Bytes(uint64(info.Size())))
 		return
 	}