You are seeing this dialog because your are initializing a new Work Folder.
The dialog is presented to give you a chance to import an existing work folder into your new Work Folder.
If you never used IMU Explorer before, you must select "No" to skip this action. This is because there are no existing work folders to import.
If you are an existing user of IMU Explorer, select "Yes" to import an existing work folder into your new work folder.
Selecting "Yes" is optional.
If you select "No", your new work folder will be initialized with IMU Explorer defaults.*End of help document*