Datastore search does not return all files

vSphere Server 4.1.0, SDK 4.1.0-254719

I'm running a Datastore search using SearchDatastoreSubFolders with a SeachSpec using a VmConfigFileQuery. For a given Datastore containing 9 virtual machines, only 1 .vmx is returned by that search. All 9 machines have all their files in their own folders, and are using the same config file version.

The relevant code sections:

my $filequery = FileQueryFlags->new(    fileOwner    => 1,    fileSize     => 1,    fileType     => 1,    modification => 1
);
my $vmxquery = VmConfigFileQuery->new(    details => VmConfigFileQueryFlags->new(        configVersion=>1,    )
);
my $searchspec = HostDatastoreBrowserSearchSpec->new(    details      => $filequery,    query        => [ '*.vmx*' ],
);
my $results = $browser->SearchDatastoreSubFolders(    datastorePath => '[datastore]',    searchSpec    => $searchspec
);

Any pointers on what I could do different are much appreciated.