When attempting to import a solution in Dynamics 365, you encounter the following error:
"The solution file is invalid. The compressed file must contain the following files at its root: solution.xml, customizations.xml, and [Content_Types].xml. Customization files exported from previous versions of Microsoft Dynamics 365 are not supported.
Error code 80048060."
This error can occur if you attempt to import a solution file that is not valid. Dynamics 365 solution files are stored as .zip files that contain files with the following names:
If you attempt to import a solution file that does not contain these files, this error will occur.
Verify the .zip file you are trying to import contains the files mentioned in the cause section and then attempt to import the solution again.
Example: If you had extracted the solution .zip file and made manual changes to customizations.xml but rezipped just that file, you would encounter this error. You need to select all of the files that were in the .zip file and choose to compress them to a zipped folder before trying to reimport them.