1. Press Win+R in keyboard . The run window will appear. Type C:Windows\Installer there , and hit enter. In the resulting window, open the folder {90140000-0011-0000-0000-0000000FF1CE} . It should contain your office icons, in .exe format, such as Wordicon.exe for MS Word icon. Take Ownership of the folder.
2. At first, let us change the MS Office icon. So right click on wordicon.exe, and open using resource hacker in the context menu. The resource hacker will open in the appropriate window, with "icon" selected in the left pane.
3. Below "icon", there is "icon group". Double click on it. On the top, there is folder 200. Double click on it, too. In the expansion tree , selecr 1033. A messege " OUT OF SYSTEM RESOURCES" may appear, just click OK there.
4. Right Click on 1033, and click on replace icon. The "Replace Icon With " window will appear.
5. Click the box "Open File With New Icon" . Browse to the icon you want there. Click on "Select new icon, and the new icon will be visible in the right side pane. Now click "Replace "
6. The "Out Of System Resources" may appear. Just click on OK as previous.
7. Click File > Save as ..... the save file window will appear . Save the new file on desktop, name it wordicon.exe.
8. Do the same steps for xlicons.exe (Excel), accicons.exe (Access), pptico.exe (PowerPoint), and the others you ant to change.
9. Finally, replace the modified files in the target folder C:Windows\Installer\{90140000-0011-0000-0000-0000000FF1CE}
10. Restart your computer , and it is done.