Stolen from an adobe forum, haven't tested it.
Apps need to be installed before you can set them as the default. You may want your.pdf files, or email, or music to automatically open using an app other than the one provided by Microsoft. To choose default apps by file type. Scroll down and select Choose default apps by file type. While browsing folders in File Explorer, you can apply the view settings of the current folder to all folders on your PC that are optimized for the same folder template type. This tutorial will show you how to set a custom default folder view for all folders for your account in Windows 10.
1-go to 'edit', select Preferences.
NOTE: X-Core outdoor models are water and weather-resistant throughout document. Connecting the outdoor X-Core to primary AC power should only be done by a licensed electrician following all local codes. Improper installation could result in shock or fire hazard. High Voltage Wiring (Outdoor Model only) 1. We have the same issue. We have hundreds of clients and the destination folder can vary several times a day. If we want to save, for interests sake, 5 incoming PDF's to the same client we have to negotiate from the default folder through a series of paths to get to the one we want. We then save the first file.
2-select from the left pane: Security (enhanced)
3-click on 'add folder path' button just below the big white box
4-pick a folder of your choice and click 'ok'. (your selected folder path will appear in that white box above the 'add folder path' button in step 3)
Default Folder X Serial Number
5-if you want to add additional folders, just repeat steps 3 & 4
Default Folder X Review
6-once you are done, click 'ok' on the preferences screen and click 'ok' again to accept the changes.