Chekout File for different file types

Hi Team,

I use checkout function for File checkout, and it works for mostly FILE type, such as .txt .doc. pdf,  however which is exclusion of .dwg file type.

Since the .dwg file has been download as "vaultserver.aspx" on my side, any solutions that how to make the checkout() compatible with dwg file.  BTW, my innovator is Version 11.

Thanks. Jen