re File handles: For years, I have been using old plastic scrwdriver handles, driving the blade out and heating the file tang a little before driving on the handle. Quickly done it doesn't soften the business end of the file. . .
On storage: I have small "warding" files up to 16" hoof rasps. There is no one storage system to handle everything. The only things "protected" with rust inhibitor are the "like new" ones that are stored in a metal drawer. In use files fit the rolled lip of wire shelving. A block of 2X4 holds the warding files. Ad infinitum, ad nauseum. . .