Is it possible to add a character to the assembly version? ex 10.1.1.1a?
10.1.1.1a
No. Assembly versions (indicated AssemblyVersionAttribute) follow System.Version, which is strictly four numbers.
AssemblyVersionAttribute
System.Version
However, you can use AssemblyInformationalVersionAttributeto get more information.
AssemblyInformationalVersionAttribute
AssemblyVersionAttribute :All version components must be integers greater than or equal to 0.
AssemblyVersionAttribute :
All version components must be integers greater than or equal to 0.