Jenkins: MSTest: Unable to specify mutiple test result files to be converted to JUnit XML format

While automating build process using Jenkins, we are using MSTest plugin to convert the generated *.trx files to JUnit xml format so that it can be shown in build report. This plugin is working fine with a single file. eg: MyProject/TestResults.trx. (%WORKSPACE% is implicit as used by the plugin)

But now since we have multiple(2) test project for the same application.(integration & unit) I want to combine both the test results and show the combined result.

For that I am trying the following Ant Fileset pattern.

<fileset dir="C:\Program Files (x86)\Jenkins\workspace\JenkinsJobWorkSpaceDir\">   
<filename name="*.trx" /> 
</fileset>

But this is not working showing the following message:

[MSTEST-PLUGIN] No MSTest TRX test report files were found. Ignoring.

Here are my two files: C:\Program Files (x86)\Jenkins\workspace\JenkinsJobWorkSpaceDir\TestResult1.trx C:\Program Files (x86)\Jenkins\workspace\JenkinsJobWorkSpaceDir\TestResult2.trx

As per instruction given under the text box for file in mstest plugin for jenkins:

it says Ant fileset pattern, which doesn't mean including that fileset tag instead use wildcard expression to include all the files in a folder.