One of the shortcomings of the .studio file format is that there is no file preview. For Mac users, there is a relatively quick solution, although not an automatic one. I have a video to show you the process.
And for those of you who prefer written steps:
-open your .studio file
-hold down shift + command + control + 4 (this is kinda like twister so feel free to use both hands)
-let go once you see the “crosshairs” cursor
-drag from one corner to the other to select a roughly square section of your file that includes its contents or a representative sample
-go to the folder where your file is located and click to select the file
-press command +i to open the Get Info window
-press the tab key or click on the icon at the upper left of the window. It will highlight in blue.
-press command-v to paste your screen capture as the new icon
-close the Get Info window
Your new icons will show in all views in the Finder, and via Quick Look (press spacebar in Open dialog or in Finder).
There are two caveats. First is that is that the “Date Modified” for the file will change to reflect the date you changed the icon… just something to be aware of if you later search for a file by Last Modified date instead of by Date Created. Secondly, you will lose your custom icon when you open and resave the file. This is some sort of Mac glitch I haven’t found a workaround for. If you know how to prevent either one please let me know.
And no, there is not a way to create a custom icon for a file in Windows. What you can do in Windows is create the screen capture with the Snipping Tool (Win Vista and later), give it the same name as your file and place it in the same folder as your file so the preview image is then paired with the studio file when browsing.