DDE library is used by me given by Windows. No custom / dll that is proprietary.

The procedure are as follow:

1. Initialize DDE
2. Create string handle for Excel Appliion (in DDE term, it's known as SERVICE)
3. Create string handle for Sheet title (TOPIC)
4. Connect to Sheet
5. Free the above handles, they will not be used anymore
6. Create string handle for mobile (ITEM) utilizing mobile speech in R1C1 mode
7. Send the information
8. To export data to a different mobile, repeat 6-7
9. It's possible to reuse the already created items' manage (in case you want to upgrade the cells frequently )
10. Before app return, free all items' chain handle
11. Disconnect Excel and sheet
12. Uninitialize DDE

Make sure to enable Allow DLL imports in Expert Advisor configurations.
You may want to disable MT4 DDE Server before running this script.

You will find two files attached in this post:
- ExcelExportLib.mq4, put this file in experts\libraries folder. This is a simple mq4 library which wrap a couple of DDE functions.
- ExcelExportTest.mq4, put this file in experts\scripts folder. This is a test script that will write text on Excel Sheet 1, mobile R2C2

Cheers,