it exports a doctype. so you could use a UIDocumentInteractionController to check if the filetype can be opened and thus the app is installed.
uti is net.openvpn.formats.ovpn
copy a file of that type (you can make such a file on OSX) to the bundle and attempt to present an interaction controller for it using presentOpenInMenuFromRect
set yourself as delegate and if it fires willShowMenu, then you no the app is there - and you dismiss the menu.
so to get you started something like this:
NSString *file = ... //path to file with UTI in question
UIDocumentInteractionController *c = ... //init with file
c.delegate = self;
_hasAppInstalledForUTI = NO;
[c present...];
if(!_hasAppInstalledForUTI) {
//act
}
...
- willPresentOpenInMenu {
[c dismissAnimated:NO];
_hasAppInstalledForUTI = YES;
}
BTW: I checked the app -- there is no url scheme.