Q. I have an error with a Microsoft Application Virtualization (App-V) OSD file. It's been removed, but I still can't launch the virtualized application.

A. When App-V hits a problem with a malformed OSD file, it tracks the bad OSD in the registry at HKEY_LOCAL_MACHINESOFTWAREMicrosoftSoftgrid4.5ClientIgnoredApps. So if you've resolved the malformed OSD, you need to delete the string value associated with the malformed OSD entry so the application will be able to launch.

Note that if you're using a 64-bit version of Windows, the registry key is HKEY_LOCAL_MACHINESOFTWAREWow6432NodeMicrosoftSoftGrid4.5ClientIgnoredApps (note the addition of Wow6432Node).

You can see in my example below that I had a bad entry for Adobe Reader. Also note it shows the time stamp of the cached OSD file.