diff --git a/Plugins/UniversalEditor.Plugins.Vocaloid/Associations/SynthesizedAudio/VPR.uexml b/Plugins/UniversalEditor.Plugins.Vocaloid/Associations/SynthesizedAudio/VPR.uexml
index 88df0b8b..c152e504 100644
--- a/Plugins/UniversalEditor.Plugins.Vocaloid/Associations/SynthesizedAudio/VPR.uexml
+++ b/Plugins/UniversalEditor.Plugins.Vocaloid/Associations/SynthesizedAudio/VPR.uexml
@@ -3,7 +3,7 @@
 	<Associations>
 		<Association>
 			<Filters>
-				<Filter Title="VOCALOID5 project (JSON/ZIP)" HintComparison="Both">
+				<Filter Title="VOCALOID5 project (JSON/ZIP)" HintComparison="Both" ContentType="application/x-vocaloid-vpr">
 					<FileNameFilters>
 						<FileNameFilter>*.vpr</FileNameFilter>
 					</FileNameFilters>
@@ -23,7 +23,7 @@
 		</Association>
 		<Association>
 			<Filters>
-				<Filter Title="VOCALOID5 voice sequence (JSON)">
+				<Filter Title="VOCALOID5 voice sequence (JSON)" ContentType="application/x-vocaloid-vpr-sequence">
 					<FileNameFilters>
 						<FileNameFilter>sequence.json</FileNameFilter>
 					</FileNameFilters>
diff --git a/Plugins/UniversalEditor.Plugins.Vocaloid/Associations/SynthesizedAudio/VSQ.uexml b/Plugins/UniversalEditor.Plugins.Vocaloid/Associations/SynthesizedAudio/VSQ.uexml
index 8f8ae081..d2da3afd 100644
--- a/Plugins/UniversalEditor.Plugins.Vocaloid/Associations/SynthesizedAudio/VSQ.uexml
+++ b/Plugins/UniversalEditor.Plugins.Vocaloid/Associations/SynthesizedAudio/VSQ.uexml
@@ -3,7 +3,7 @@
 	<Associations>
 		<Association>
 			<Filters>
-				<Filter Title="VOCALOID2 voice sequence (MIDI)">
+				<Filter Title="VOCALOID2 voice sequence (MIDI)" ContentType="application/x-vocaloid-vsq">
 					<FileNameFilters>
 						<FileNameFilter>*.vsq</FileNameFilter>
 					</FileNameFilters>
diff --git a/Plugins/UniversalEditor.Plugins.Vocaloid/Associations/SynthesizedAudio/VSQX.uexml b/Plugins/UniversalEditor.Plugins.Vocaloid/Associations/SynthesizedAudio/VSQX.uexml
index 8aceac08..442bfc2e 100644
--- a/Plugins/UniversalEditor.Plugins.Vocaloid/Associations/SynthesizedAudio/VSQX.uexml
+++ b/Plugins/UniversalEditor.Plugins.Vocaloid/Associations/SynthesizedAudio/VSQX.uexml
@@ -3,7 +3,7 @@
 	<Associations>
 		<Association>
 			<Filters>
-				<Filter Title="VOCALOID3 voice sequence (XML)">
+				<Filter Title="VOCALOID3 voice sequence (XML)" ContentType="application/x-vocaloid-vsqx+xml">
 					<FileNameFilters>
 						<FileNameFilter>*.vsqx</FileNameFilter>
 					</FileNameFilters>