[FEATURE] add appIsInstalled feature

[pawellesniowski]

Thank you SO much for your plugin it helped me a lot with PDF files, however, I have a big problem with opening .DOCX files. I am not able to use the Cordova file opener, so I gladly jumped on community version.

Cordoba file-opener has a method to check whether we have an app to open .docx files:
capacitorFileOpener.appIsInstalled(userDocument.appId), then we install the appropriate app and we can open .docx files

In the capacitor-community file opener, we do not have the option to look for the app,
Opening with the community file opener does not work eighter:

const  docksMimeType = "application/vnd.openxmlformats-officedocument.wordprocessingml.document"
FileOpener.open({ filePath: downloadedPath, contentType: docksMimeType, openWithDefault: false })

So question/feature request is:
How we can open .docx files with your plugin.

Thank you!

[ryaa]

There is no appIsInstalled method, similar to https://github.com/pwlin/cordova-plugin-file-opener2#fileopener2appisinstalledpackageid-callbackcontext right now, so this looks like this is a feature request.
PR is welcomed :)

[Galvictor]

pdf, docx and xlsx works fine but pptx is not working is give me an error:

[Galvictor]

Now it worked! I had to install a pptx viewer on my cellphone.