Xattr to remove link from saved attachment

Targets macOS
1

As I was fed-up to read info for my files to remove saved attachment link (file I received as attachment in an email), I added a function to one of my software to do it.
My Xojo line code is:
CdeShell.Execute "xattr -d com.apple.metadata:kMDLabel_rm6yhtlxtile5o7f6kgch4s3fm " + MyFolderItem.ShellPath
I used xattred to know what is the xattr to remove. It works for almost all my files.
And just now my software didn’t work for a file, I read its xattr and it is:
com.apple.metadata:kMDLabel_6h22tmh5kw3ti3x57hvtqy4nze

Question 1: How can I know how many xattr exist for saved attachment link?
Question 2: I’m not good in Shell, how can I remove the two xattr in one command line?
Something like:
CdeShell.Execute "xattr -d com.apple.metadata:kMDLabel_rm6yhtlxtile5o7f6kgch4s3fm com.apple.metadata:kMDLabel_6h22tmh5kw3ti3x57hvtqy4nze " + MyFolderItem.ShellPath
or
CdeShell.Execute "xattr -d com.apple.metadata:kMDLabel_* " + MyFolderItem.ShellPath

Thank you very much for your help.

2

I couldn’t find very much info about that flag, but I wouldn’t expect that flag to be preventing files from opening.

Perhaps you should dig in a little deeper and discover if your app is correctly handling the flag. From the very little information I found (above) it was suggested that sometimes that flag can be too big for certain software. That would be something you could fix in your software, rather than routinely trashing metadata.

Quarantine flags will prevent files from opening and those can be cleaned up easily with this app: GitHub - alienator88/Sentinel: Configure Gatekeeper, remove apps from quarantine and self-sign apps

3

Thank you Tim, I will read xattr:
CdeShell.Execute "xattr " + MyFolderItem.ShellPath
and if a xattr which beginwith “com.apple.metadata:kMDLabel_” exist then remove it.