The “com.apple.applesingle-archive” tweak listed in comment 18 works for me.

Spacebar now opens .mxml and .as

The answer is above (see reply no. 8), but to clarify, simply edit the LSItemContentTypes array in QLCC info.plist (I used TextMate rather than the default app for the sake of readability) and include public.archive.applesingle as one of the types to be picked up.

This is a *total* hack – basically it tricks Finder into thinking that files ending in .as (which are locked in association with the applesingle mime-type because Adobe don’t export a profile with their apps) *can* be previewed in QuickLook, whereas ordinarily they can’t (applesingle being a kind of archive file).

Hope that sheds some light… and hope that Adobe do something to make CS files (.ai, .as) previewable by default in the future. If not, let me know where you’re going wrong and I’ll try to help… although to be honest I’m no more of an expert than you: everything I know about it is what’s on here.

Thanks again for all the help.

Thanks for your help and the explanation of how UTExportedTypeDeclarations works – I’ve been astounded at how little documentation there is on Quick Look as a whole.

I confess I cheated in the end and simply added public.archive.applesingle to the LSItemContentTypes array in the QLCC info.plist. So far nothing has blown up.

If there’s no UTTypeIdentifier in Adobe’s Info.plist file then they’re not even attempting to define a UTI so it’s not surprising that the system’s binding takes precedence. One more (slightly dangerous) thing to try: make a UTExportedTypeDeclarations section and put the .as UTI in that. It should be something like this (substituting square brackets for angle) and it should go at the same level as the current UTImportedTypeDeclarations element:

[key]UTExportedTypeDeclarations[/key]
    [array]
        [dict]
            [key]UTTypeIdentifier[/key]
            [string]com.adobe.actionscript-source[/string]
            ...
        [/dict]
    [/array]

The idea is that exported UTIs are ones where you are the authoritative source for that UTI, whereas imported UTIs are those that don’t really belong to your app but that you might need to define if they don’t exist on the system.

I call this approach “dangerous” because if Adobe ever does decide to define a UTI and uses something besides “com.adobe.actionscript-source” for the type identifier then the QLCC definition may prevent those .as files from being associated with Adobe’s app. That’s why the UTIs in QLCC are all of the imported kind.

Depressingly it doesn’t take too long for the problem to resurface: logging out or restarting has the effect of returning the UTI to public.archive.applesingle

Reinstalling (repairing) Flash had no effect either.

Please forgive the rash of comments, but I’m mainly leaving these updates in the hope that others won’t waste as much time as I have on this issue.

w00t! It turned out that I needed to refresh the LaunchServices database.

I used

/System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/LaunchServices.framework/Versions/A/Support/lsregister -kill

Hope that helps someone.

I installed RCDefaultApp in an attempt to re-map “as” to a UTI of “com.adobe.flash.actionscript” and a MIME-type of “application/x-actionscript” but when I look at the extension “as” it is still firmly associated with “public.archive.applesingle” and “application/applefile” (respectively).

I’m still Googling furiously to try and the answer by myself, but if you have any ideas…?

That’s exactly my frustration: I edited the info.plist – duplicating a block and making the appropriate substitutions – both in QLCC contents and in Flash, used touch to update the UTI references, qlmanage -r to reload the QL database… all to no avail.

I agree with you that looks as though the misassociation of the .as extension with applesingle is screwing things up, but I don’t know how – short of repairing Flash via the installer – to fix this: as I say the Info pane for any .as file gives its kind as “Adobe Flash ActionScript File” not applesingle.

Any thoughts? Many thanks in advance.