fix #59561

src/vs/workbench/services/files/electron-browser/fileService.ts

@@ -588,10 +588,24 @@ export class FileService extends Disposable implements IFileService {
 					else {
 
 						// 4.) truncate
+						let retryFromFailingTruncate = true;
 						return pfs.truncate(absolutePath, 0).then(() => {
+							retryFromFailingTruncate = false;
 
 							// 5.) set contents (with r+ mode) and resolve
 							return this.doSetContentsAndResolve(resource, absolutePath, value, addBom, encodingToWrite, { flag: 'r+' });
+						}, error => {
+							if (retryFromFailingTruncate) {
+								if (this.environmentService.verbose) {
+									console.error(`Truncate failed (${error}), falling back to normal save`);
+								}
+
+								// we heard from users that fs.truncate() fails (https://github.com/Microsoft/vscode/issues/59561)
+								// in that case we simply save the file without truncating first (same as macOS and Linux)
+								return this.doSetContentsAndResolve(resource, absolutePath, value, addBom, encodingToWrite);
+							}
+
+							return TPromise.wrapError(error);
 						});
 					}
 				});