diff --git a/Frontend/_operation.html b/Frontend/_operation.html
index b24fc96..64adb49 100644
--- a/Frontend/_operation.html
+++ b/Frontend/_operation.html
@@ -669,7 +669,7 @@
 								}
 								else if (/\.(xls?x|doc?x|ptt?x|pdf|zip|rar|7zip|txt|odt|xml|rtf|ods|odp|pps?x)$/i.test(v.ori_file_name)) {
 									icons = null
-									if (extName == "xlsx" || extName == xls)
+									if (extName == "xlsx" || extName == "xls")
 										icons = "fas fa-file-excel";
 									else if (extName == "pdf" || extName == "ods")
 										icons = "fas fa-file-pdf";
@@ -780,7 +780,7 @@
 								}
 								else if (/\.(xls?x|doc?x|ptt?x|pdf|zip|rar|7zip|txt|odt|xml|rtf|ods|odp|pps?x)$/i.test(v.ori_file_name)) {
 									icons = null
-									if (extName == "xlsx" || extName == xls)
+									if (extName == "xlsx" || extName == "xls")
 										icons = "fas fa-file-excel";
 									else if (extName == "pdf" || extName == "ods")
 										icons = "fas fa-file-pdf";
@@ -1375,7 +1375,7 @@
 						}
 						else if (/\.(xls?x|doc?x|ptt?x|pdf|zip|rar|7zip|txt|odt|xml|rtf|ods|odp|pps?x)$/i.test(v.ori_file_name)) {
 							icons = null
-							if (extName == "xlsx" || extName == xls)
+							if (extName == "xlsx" || extName == "xls")
 								icons = "fas fa-file-excel";
 							else if (extName == "pdf" || extName == "ods")
 								icons = "fas fa-file-pdf";