MWB: Copy&PasteBetweenExcelCellsBecomePictures

### Microsoft PowerToys version

0.100.2

### Installation method

Microsoft Store

### Area(s) with issue?

Mouse Without Borders

### Steps to reproduce

1. Connect PC 1 and PC 2 via Mouse Without Borders.
2. Open Microsoft Excel or WPS Excel on both PC 1 and PC 2.
3. Copy cells in xlsx files between PC 1 and PC 2.
4. On either PC, Copy cells within a worksheet or between worksheets or between workbooks.

### ✔️ Expected Behavior

The original cells can overwrite the target cells.

### ❌ Actual Behavior

The selected original cells are pasted as pictures, even on the same PC and in the same worksheet.

### Upload Bug Report ZIP-file

[MouseWithoutBorders.zip](https://github.com/user-attachments/files/29741810/MouseWithoutBorders.zip)

### Additional Information

Windows 10 Professional 22H2 & Windows 11 Home 25H2

Simplified Chinese
System Installation
Running as admin

### Other Software

Microsoft Office LTSC Professional Plus 2024 Excel
WPS 12.1.0

Start by reproducing the copy-and-paste steps with Mouse Without Borders and Microsoft Excel or WPS Excel on Windows 10 or 11, including same-PC worksheet and workbook copies. Compare clipboard behavior across the listed scenarios and inspect the uploaded MouseWithoutBorders.zip report for clues. Done means copied cells remain editable cells and can overwrite target cells rather than being pasted as pictures.

Written by the indexing model from the issue text.