Relative URIs are not supported.

[AngrySKL]

ts:
this.fileOpener
.open(
'/assets/files/Mobile Code Style.docx',
'application/vnd.openxmlformats-officedocument.wordprocessingml.document'
)
.then(() => console.log('File is opened'))
.catch((e) => console.log('Error opening file', e));

code:
CordovaResourceApi resourceApi = webView.getResourceApi();
Uri fileUri = resourceApi.remapUri(Uri.parse(fileArg));

cordova info

Here is the output:
will throw exception Relative URIs are not supported.

Plugin version

cordova plugin version | grep cordova-plugin-file-opener2

Here is the output:

Sample Code that illustrates the problem

Logs taken while reproducing problem

Run

adb logcat PluginManager:V CordovaPlugin:V CordovaLog:V chromium:V *:S

while testing the bug in your app to get some output from your error. This will help you to understand more about the nature of your problem.