In Manexcloud , when exporting to Excel and you receive the below error: Store must be open for this operation.

In the application pool, turn the Load User Profile to 'True'

When this option is set to False ( the profile is not loaded ) your application will use the c:\windows\temp folder as its temporary directory. If you have other application pools even they will use the same c:\windows\temp folder. If you set the option to load the user profile the temporary directory will be now change to use the profile’s temporary folder C:\Users\apppooluserid\AppData\Local\Temp. If the profile is loaded you also have access to all the custom environment variables for that user.