diff --git a/src/ItemsExplorer/RuleProvider.ts b/src/ItemsExplorer/RuleProvider.ts
index 9d2c964..09c6b82 100644
--- a/src/ItemsExplorer/RuleProvider.ts
+++ b/src/ItemsExplorer/RuleProvider.ts
@@ -41,7 +41,7 @@ export class RuleProvider {
         let editor = window.activeTextEditor
         let document = editor.document
 
-        if (document.fileName.split('.')[1] === 'rules') {
+        if (document.fileName.endsWith('rules')) {
             let position = editor.selection.active
             let newPosition = position.with(position.line, 0)
 
diff --git a/src/ItemsExplorer/SitemapPartialProvider.ts b/src/ItemsExplorer/SitemapPartialProvider.ts
index bc12374..9f8cbef 100644
--- a/src/ItemsExplorer/SitemapPartialProvider.ts
+++ b/src/ItemsExplorer/SitemapPartialProvider.ts
@@ -39,7 +39,7 @@ export class SitemapPartialProvider {
         let editor = window.activeTextEditor
         let document = editor.document
 
-        if (document.fileName.split('.')[1] === 'sitemap') {
+        if (document.fileName.endsWith('sitemap')) {
             editor.insertSnippet(SNIPPET_TEMPLATE(this.item), editor.selection.active)
         } else {
             window.showInformationMessage('Please open "*.sitemap" file in the editor to add a new snippet.')
diff --git a/src/ThingsExplorer/ItemsProvider.ts b/src/ThingsExplorer/ItemsProvider.ts
index 4aed5c7..d830b80 100644
--- a/src/ThingsExplorer/ItemsProvider.ts
+++ b/src/ThingsExplorer/ItemsProvider.ts
@@ -76,7 +76,7 @@ export class ItemsProvider {
         let editor = window.activeTextEditor
         let document = editor.document
 
-        if (document.fileName.split('.')[1] === 'items') {
+        if (document.fileName.endsWith('items')) {
             let template
 
             if (this.treeItem.treeItemType === 'thing') {
diff --git a/src/extension.ts b/src/extension.ts
index d139bb6..709c9f5 100644
--- a/src/extension.ts
+++ b/src/extension.ts
@@ -54,7 +54,7 @@ async function init(context: ExtensionContext, disposables: Disposable[], config
         let fileName = path.basename(absolutePath)
         let ui = config.sitemapPreviewUI
 
-        if (fileName.split('.')[1] === 'sitemap') {
+        if (fileName.endsWith('sitemap')) {
             let sitemap = fileName.split('.')[0]
             return openUI({
                 route: `/${ui}/app?sitemap=${sitemap}`,