Use PDS name for downloaded member file extensions

packages/zowe-explorer/__tests__/__unit__/trees/dataset/DatasetUtils.unit.test.ts

@@ -139,15 +139,15 @@ describe("Dataset utils unit tests - function getExtensionMap", () => {
         } as any;
     }
 
-    it("should return extension map based on member names", async () => {
+    it("should not infer extensions from member names", async () => {
         const mockNode = createMockNode("TEST.PDS", [{ label: "MEMBER1" }, { label: "COBOL" }, { label: "XML" }]);
 
         const result = await DatasetUtils.getExtensionMap(mockNode, false);
 
         expect(result).toEqual({
             member1: "txt",
-            cobol: "cbl",
-            xml: "xml",
+            cobol: "txt",
+            xml: "txt",
         });
     });
 
@@ -158,7 +158,7 @@ describe("Dataset utils unit tests - function getExtensionMap", () => {
 
         expect(result).toEqual({
             MEMBER1: "txt",
-            COBOL: "cbl",
+            COBOL: "txt",
             ".f@K3": "txt",
         });
     });

packages/zowe-explorer/src/trees/dataset/DatasetUtils.ts

@@ -176,39 +176,11 @@ export class DatasetUtils {
     ): Promise<{ [key: string]: string }> {
         const extensionMap: { [key: string]: string } = {};
         const children = await node.getChildren();
+        const extension = overrideExtension ?? DatasetUtils.getExtension(node.label as string) ?? ".txt";
 
         for (const child of children) {
-            let extension;
             let label = child.label as string;
 
-            if (overrideExtension) {
-                extension = overrideExtension;
-            } else {
-                for (const [ext, matches] of DS_EXTENSION_MAP.entries()) {
-                    if (ext === ".c") {
-                        // Special case for ".c" extension, skip the following logic
-                        // As it's not unique enough and would otherwise match on anything containing "C"
-                        // TODO: rrevisit later if this can be handled better while still allowing c files
-                        continue;
-                    }
-                    if (matches.some((match) => (match instanceof RegExp ? match.test(label) : label.includes(match)))) {
-                        extension = ext;
-                        break;
-                    }
-                }
-
-                // If no extension found, fall back to using the PDS name as extension
-                if (!extension) {
-                    const parentExtension = DatasetUtils.getExtension(node.label as string);
-                    if (parentExtension) {
-                        extension = parentExtension;
-                    } else {
-                        // Use default extension if nothing else matches
-                        extension = ".txt";
-                    }
-                }
-            }
-
             if (!uppercaseNames) {
                 label = label.toLowerCase();
             }