0.97: Save As...Filename Extension

[vane]

XnView: MP 0.97 - 64-bit
OS: Windows 7 - 64-bit

Effect: Filename extension is not the same as the current opened image when executing Save As.

To reproduce:
1. Open an image file (PNG)
2. Exec 'Save As'
3. The file type is the last used type (JPG)

Expected behaviour: The default file types should be the same as the opened image when executing Save As.

[xnview]

'Save as' keep last format used