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Posted on 1999-07-19
Medium Priority
Last Modified: 2010-04-06
Is there a way to enter a file extension into the registry such that whenever the user clicks on a file with a certain extension, it will open up my program to edit the file.
Question by:jackjoker
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LVL 10

Accepted Solution

Lischke earned 20 total points
ID: 1389494
procedure RegisterFile;

var Reg: TRegistry;

  Reg := TRegistry.Create;
    Reg.RootKey := HKEY_CLASSES_ROOT;
    Reg.OpenKey('\.xxx', True);
    Reg.WriteString('', 'MyProgram');
    Reg.OpenKey('\MyProgram', True);
    Reg.WriteString('', 'a very special file');
    Reg.OpenKey('\MyProgram\DefaultIcon', True);
    Reg.WriteString('', Application.ExeName + ', 1');
    Reg.OpenKey('\MyProgram\Shell\open\command', True);
    Reg.WriteString('', Application.ExeName + ' "%1"');
    ShowMessage('successfully registered');

Ciao, Mike
LVL 17

Expert Comment

ID: 1389495
not quick enough :-(
this comment was originally from someone else and it works so thanks to them although is same as answer

Let's say you want to register the extension "*.vif" for a "very important file".

(1) Create a new key "HKEY_CLASSES_ROOT\.vif".
(2) Set "HKEY_CLASSES_ROOT\.vif\(default)" to "veryImportantFile". (don't write to the value "(default)", instead write to "").
(3) Create a new key "HKEY_CLASSES_ROOT\veryImportantFile\shell\open\command".
(4) Set "HKEY_CLASSES_ROOT\veryImportantFile\shell\open\command\(default)" to "c:\yourAppPath\yourApp.exe %1".
(5) Create a new key "HKEY_CLASSES_ROOT\veryImportantFile\defaultIcon".
(6) Set "HKEY_CLASSES_ROOT\veryImportantFile\defaultIcon\(default)" to e.g. "c:\yourAppPath\yourApp.exe,1"
 or another icon resource. The ",1" is the icon index in your exefile for the document icon.

Regards Barry

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