diff --git a/conn.go b/conn.go
index 78efc0a..a492256 100644
--- a/conn.go
+++ b/conn.go
@@ -228,7 +228,7 @@ func (c *Conn) Filename(schema string) *vfs.Filename {
 		ptr = c.arena.string(schema)
 	}
 	r := c.call("sqlite3_db_filename", uint64(c.handle), uint64(ptr))
-	return vfs.OpenFilename(c.ctx, c.mod, uint32(r), vfs.OPEN_MAIN_DB)
+	return vfs.GetFilename(c.ctx, c.mod, uint32(r), vfs.OPEN_MAIN_DB)
 }
 
 // ReadOnly determines if a database is read-only.
diff --git a/vfs/adiantum/hbsh.go b/vfs/adiantum/hbsh.go
index 6562352..4522104 100644
--- a/vfs/adiantum/hbsh.go
+++ b/vfs/adiantum/hbsh.go
@@ -17,6 +17,7 @@ type hbshVFS struct {
 }
 
 func (h *hbshVFS) Open(name string, flags vfs.OpenFlag) (vfs.File, vfs.OpenFlag, error) {
+	// notest // OpenFilename is called instead
 	return nil, 0, sqlite3.CANTOPEN
 }
 
diff --git a/vfs/file.go b/vfs/file.go
index 93a2f7e..176b250 100644
--- a/vfs/file.go
+++ b/vfs/file.go
@@ -69,6 +69,7 @@ func (vfsOS) Access(name string, flags AccessFlag) (bool, error) {
 }
 
 func (vfsOS) Open(name string, flags OpenFlag) (File, OpenFlag, error) {
+	// notest // OpenFilename is called instead
 	return nil, 0, _CANTOPEN
 }
 
diff --git a/vfs/filename.go b/vfs/filename.go
index e23575b..51d0b8d 100644
--- a/vfs/filename.go
+++ b/vfs/filename.go
@@ -20,8 +20,8 @@ type Filename struct {
 	stack [2]uint64
 }
 
-// OpenFilename is an internal API users should not call directly.
-func OpenFilename(ctx context.Context, mod api.Module, id uint32, flags OpenFlag) *Filename {
+// GetFilename is an internal API users should not call directly.
+func GetFilename(ctx context.Context, mod api.Module, id uint32, flags OpenFlag) *Filename {
 	if id == 0 {
 		return nil
 	}
@@ -66,6 +66,10 @@ func (n *Filename) path(method string) string {
 	if n == nil || n.zPath == 0 {
 		return ""
 	}
+	if n.flags&(OPEN_MAIN_DB|OPEN_MAIN_JOURNAL|OPEN_WAL) == 0 {
+		return ""
+	}
+
 	n.stack[0] = uint64(n.zPath)
 	fn := n.mod.ExportedFunction(method)
 	if err := fn.CallWithStack(n.ctx, n.stack[:]); err != nil {
diff --git a/vfs/vfs.go b/vfs/vfs.go
index d624aa7..e9a63cc 100644
--- a/vfs/vfs.go
+++ b/vfs/vfs.go
@@ -132,26 +132,20 @@ func vfsAccess(ctx context.Context, mod api.Module, pVfs, zPath uint32, flags Ac
 
 func vfsOpen(ctx context.Context, mod api.Module, pVfs, zPath, pFile uint32, flags OpenFlag, pOutFlags, pOutVFS uint32) _ErrorCode {
 	vfs := vfsGet(mod, pVfs)
-
-	var path string
-	if zPath != 0 {
-		path = util.ReadString(mod, zPath, _MAX_PATHNAME)
-	}
+	name := GetFilename(ctx, mod, zPath, flags)
 
 	var file File
 	var err error
 	if ffs, ok := vfs.(VFSFilename); ok {
-		name := OpenFilename(ctx, mod, zPath, flags)
 		file, flags, err = ffs.OpenFilename(name, flags)
 	} else {
-		file, flags, err = vfs.Open(path, flags)
+		file, flags, err = vfs.Open(name.String(), flags)
 	}
 	if err != nil {
 		return vfsErrorCode(err, _CANTOPEN)
 	}
 
 	if file, ok := file.(FilePowersafeOverwrite); ok {
-		name := OpenFilename(ctx, mod, zPath, flags)
 		if b, ok := util.ParseBool(name.URIParameter("psow")); ok {
 			file.SetPowersafeOverwrite(b)
 		}