Index: utils/ofarc/GZIPArchive.m
==================================================================
--- utils/ofarc/GZIPArchive.m
+++ utils/ofarc/GZIPArchive.m
@@ -41,10 +41,12 @@
 			  forKey: key];
 
 	[fileManager setAttributes: destinationAttributes
 		      ofItemAtPath: destination];
 #endif
+
+	[app quarantineFile: destination];
 }
 
 static void
 setModificationDate(OFString *path, OFGZIPStream *stream)
 {

Index: utils/ofarc/LHAArchive.m
==================================================================
--- utils/ofarc/LHAArchive.m
+++ utils/ofarc/LHAArchive.m
@@ -48,23 +48,25 @@
 setPermissions(OFString *path, OFLHAArchiveEntry *entry)
 {
 #ifdef OF_FILE_MANAGER_SUPPORTS_PERMISSIONS
 	OFNumber *POSIXPermissions = entry.POSIXPermissions;
 
-	if (POSIXPermissions == nil)
-		return;
-
-	POSIXPermissions = [OFNumber numberWithUnsignedShort:
-	    POSIXPermissions.unsignedShortValue & 0777];
-
-	OFFileAttributes attributes = [OFDictionary
-	    dictionaryWithObject: POSIXPermissions
-			  forKey: OFFilePOSIXPermissions];
-
-	[[OFFileManager defaultManager] setAttributes: attributes
-					 ofItemAtPath: path];
+	if (POSIXPermissions != nil) {
+		OFFileAttributes attributes;
+
+		POSIXPermissions = [OFNumber numberWithUnsignedShort:
+		    POSIXPermissions.unsignedShortValue & 0777];
+		attributes = [OFDictionary
+		    dictionaryWithObject: POSIXPermissions
+				  forKey: OFFilePOSIXPermissions];
+
+		[[OFFileManager defaultManager] setAttributes: attributes
+						 ofItemAtPath: path];
+	}
 #endif
+
+	[app quarantineFile: path];
 }
 
 static void
 setModificationDate(OFString *path, OFLHAArchiveEntry *entry)
 {

Index: utils/ofarc/OFArc.h
==================================================================
--- utils/ofarc/OFArc.h
+++ utils/ofarc/OFArc.h
@@ -29,10 +29,11 @@
 # define S_IRWXO 0
 #endif
 
 @interface OFArc: OFObject <OFApplicationDelegate>
 {
+	OFData *_quarantine;
 	int8_t _overwrite;
 @public
 	int8_t _outputLevel;
 	int _exitStatus;
 }
@@ -45,8 +46,9 @@
 	      outFileName: (OFString *)outFileName;
 - (ssize_t)copyBlockFromStream: (OFStream *)input
 		      toStream: (OFStream *)output
 		      fileName: (OFString *)fileName;
 - (nullable OFString *)safeLocalPathForPath: (OFString *)path;
+- (void)quarantineFile: (OFString *)path;
 @end
 
 OF_ASSUME_NONNULL_END

Index: utils/ofarc/OFArc.m
==================================================================
--- utils/ofarc/OFArc.m
+++ utils/ofarc/OFArc.m
@@ -34,10 +34,11 @@
 #import "TarArchive.h"
 #import "ZIPArchive.h"
 #import "ZooArchive.h"
 
 #import "OFCreateDirectoryFailedException.h"
+#import "OFGetItemAttributesFailedException.h"
 #import "OFInvalidArgumentException.h"
 #import "OFInvalidFormatException.h"
 #import "OFNotImplementedException.h"
 #import "OFOpenItemFailedException.h"
 #import "OFReadFailedException.h"
@@ -473,10 +474,23 @@
 
 		archive = [self openArchiveWithIRI: IRI
 					      type: type
 					      mode: mode
 					  encoding: encoding];
+
+#ifdef OF_MACOS
+		@try {
+			OFString *attributeName = @"com.apple.quarantine";
+
+			_quarantine = [[[OFFileManager defaultManager]
+			    extendedAttributeDataForName: attributeName
+					     ofItemAtIRI: IRI] retain];
+		} @catch (OFGetItemAttributesFailedException *e) {
+			if (e.errNo != /*ENOATTR*/ 93)
+				@throw e;
+		}
+#endif
 
 		if (outputDir != nil) {
 			OFFileManager *fileManager =
 			    [OFFileManager defaultManager];
 
@@ -814,6 +828,17 @@
 
 	objc_autoreleasePoolPop(pool);
 
 	return [path autorelease];
 }
+
+- (void)quarantineFile: (OFString *)path
+{
+#ifdef OF_MACOS
+	if (_quarantine != nil)
+		[[OFFileManager defaultManager]
+		    setExtendedAttributeData: _quarantine
+				     forName: @"com.apple.quarantine"
+				ofItemAtPath: path];
+#endif
+}
 @end

Index: utils/ofarc/TarArchive.m
==================================================================
--- utils/ofarc/TarArchive.m
+++ utils/ofarc/TarArchive.m
@@ -47,10 +47,12 @@
 			  forKey: OFFilePOSIXPermissions];
 
 	[[OFFileManager defaultManager] setAttributes: attributes
 					 ofItemAtPath: path];
 #endif
+
+	[app quarantineFile: path];
 }
 
 static void
 setModificationDate(OFString *path, OFTarArchiveEntry *entry)
 {

Index: utils/ofarc/ZIPArchive.m
==================================================================
--- utils/ofarc/ZIPArchive.m
+++ utils/ofarc/ZIPArchive.m
@@ -56,10 +56,12 @@
 
 		[[OFFileManager defaultManager] setAttributes: attributes
 						 ofItemAtPath: path];
 	}
 #endif
+
+	[app quarantineFile: path];
 }
 
 static void
 setModificationDate(OFString *path, OFZIPArchiveEntry *entry)
 {

Index: utils/ofarc/ZooArchive.m
==================================================================
--- utils/ofarc/ZooArchive.m
+++ utils/ofarc/ZooArchive.m
@@ -39,23 +39,25 @@
 setPermissions(OFString *path, OFZooArchiveEntry *entry)
 {
 #ifdef OF_FILE_MANAGER_SUPPORTS_PERMISSIONS
 	OFNumber *POSIXPermissions = entry.POSIXPermissions;
 
-	if (POSIXPermissions == nil)
-		return;
-
-	POSIXPermissions = [OFNumber numberWithUnsignedShort:
-	    POSIXPermissions.unsignedShortValue & 0777];
-
-	OFFileAttributes attributes = [OFDictionary
-	    dictionaryWithObject: POSIXPermissions
-			  forKey: OFFilePOSIXPermissions];
-
-	[[OFFileManager defaultManager] setAttributes: attributes
-					 ofItemAtPath: path];
+	if (POSIXPermissions != nil) {
+		OFFileAttributes attributes;
+
+		POSIXPermissions = [OFNumber numberWithUnsignedShort:
+		    POSIXPermissions.unsignedShortValue & 0777];
+		attributes = [OFDictionary
+		    dictionaryWithObject: POSIXPermissions
+				  forKey: OFFilePOSIXPermissions];
+
+		[[OFFileManager defaultManager] setAttributes: attributes
+						 ofItemAtPath: path];
+	}
 #endif
+
+	[app quarantineFile: path];
 }
 
 static void
 setModificationDate(OFString *path, OFZooArchiveEntry *entry)
 {