There is indeed a bug related to mIRC not picking up the correct default browser for users of Windows Vista. This is a known bug and Khaled has said that the issue
will be fixed for the next version of mIRC.
A possible solution is to use mIRC's scripting language to force your default browser to open, at least when you click on links in the channel window. To load the following script press
ALT+R then, if the script editor does not present you with a blank script file, go to
File >
New and paste the following into the editor:
on $^*:HOTLINK:/^\W*(((?:https?|ftps?):\/\/|www\.)\S+)\b/:*:return
on $*:HOTLINK:/^\W*(((?:https?|ftps?):\/\/|www\.)\S+)\b/:*:run firefox.exe -new-tab $regml(1)This only applies to Firefox as that seems to be, by far, the desired browser for those who have reported the issue. The principle is the same for other browsers though.
Possible other solutions are posted in
this thread, they may or may not work for you.
Please also note that Firefox versions prior to 2.0.0.2 are not Vista compliant and obviously this has nothing to do with mIRC - therefore, before thinking you have a problem, please upgrade to the latest version of Firefox by going to
Help >
Check for updates... in the Firefox browser window. The Firefox team themselves post the following advice for those who are finding links are not opening in certain programs (this is as of 2.0.0.2):
Clicking links in some applications (e.g. some instant messaging programs) might not open them in Firefox, even if you have set it as your default browser. To workaround this problem, go to Start -> Default Programs -> Set default programs for this computer, expand custom, select the radio button next to the app you want to set as the system wide default app (e.g. Firefox, etc.), and apply.
If you search for
+vista +default +browser on the
Search page you'll find a few other threads related to this bug, feel free to read them.
Thanks for your patience, and happy chatting!
Thanks to argv0 for the code above 
