Index: utils/ofarc/ZIPArchive.m
==================================================================
--- utils/ofarc/ZIPArchive.m
+++ utils/ofarc/ZIPArchive.m
@@ -131,11 +131,11 @@
 	    wantsPartNumbered: (unsigned int)partNumber
 	       lastPartNumber: (unsigned int)lastPartNumber
 {
 	OFIRI *IRI;
 
-	if ([_archiveIRI.path.pathExtension caseInsensitiveCompare: @"zip"] !=
+	if ([_archiveIRI.pathExtension caseInsensitiveCompare: @"zip"] !=
 	    OFOrderedSame)
 		return nil;
 
 	if (partNumber > 98)
 		return nil;
@@ -144,11 +144,11 @@
 		IRI = _archiveIRI;
 	else {
 		OFMutableIRI *copy = [[_archiveIRI mutableCopy] autorelease];
 		[copy deletePathExtension];
 		[copy appendPathExtension: [OFString
-		    stringWithFormat: @".z%02u", partNumber + 1]];
+		    stringWithFormat: @"z%02u", partNumber + 1]];
 		[copy makeImmutable];
 		IRI = copy;
 	}
 
 	return (OFSeekableStream *)[OFIRIHandler openItemAtIRI: IRI mode: @"r"];