Screenshot format
From OpenTTD
The format to use when taking screenshots. This is a client-setting only.
[edit] Use
"BMP" is the default setting. You may change this setting through the game options window or openttd.cfg with the following syntax:
[misc] screenshot_format = <Valid options>
Valid options: [ <empty> | bmp | png | pcx ]
Default: <empty>
If an invalid setting is entered, then it will revert to the default.
