Here is the procedure to associate a file with the igs extension with CADlook on Windows. If you cannot accomplish the association by these steps, you may want to google "file extension association" for your version of the Windows.

Once you finish the steps, when you double click on an iges file, like sample.igs, CADlook will start and load the file automatically.

On Windows 7,

1. Right mouse click on the sample.igs.

2. Select Open or Open With

3. Click "Select a program from a list of installed programs"

4. Click on the Browse ... button to choose CADlook.exe (or CADlook64.exe). It resides in your CADlook installation folder.

5. Make sure the "Always use the selected program to open this kind of file" is checked.

6. Click on OK.

On other OS,

1. Click on Windows Start | Settings | Control Panel to open the Control Panel.

2. Double click on "Folder Options" in Control Panel window.

3. Select "File Types" tab in Folder Options window.

4. Scroll down the "Registered file types:" list to find IGS.

Click on IGS entry in the list.

If IGS is not in the list. Click on the "New" button. In the "Create New Extension" dialog, enter IGS in the "File Extension:" box. (The "Associated File Type:" should be ). Click "Ok" button in the "Create New Extension" dialog.

5. Click on the "Change..." button in the lower half of the "Folder Options" window.

6. In Windows XP only, click on "Select the program from a list". The click the "OK" button.

7. A window will appear to present you with all the applications. If you find CADlook in the list, click on it and then click the "OK" button.

If you do not find CADlook in the list, click the "Browse..." button. Another window will appear. In this window, move to your CADlook folder and click on CADlook.exe. Then click the "Open" or "Close" buttons until you close the "Folder Options" window. Then congradulations! You are done!

If you want to associate more file types (like, IGES, stp, STEP, etc.), repeat the process for each extension.

For more information, open a folder window and click on Help in the menu bar. Search for "file type association".