Ressurecting a old thread :D but with VFP 9 SP1

I was able to make it work for a bunch of file extensions but certain ones did not work and return the error:

"Ole IDispatch exception code 0 from WshShell.RegRead:
Unable to open registry key "HKCR\.MKV\" for reading..."

.MKV is a video file and exist in the registry

The info when I click on it is:
(default) REG_SZ (value not set)

but a .AVi
(default) REG_SZ avifile

Am I wrong to expect a "real value" for this to work properly and a new extension like .AMZN(Amazon Unbox) must a have a least a program to make it work?

To bad that the value don't return an error or empty string and I will have to catch it myself.