CRN Install Folder

[gatorfe]

Hello, we have a running CRN system currently in one of our test environments.  The server it runs on though is running very low on space on the c drive.  I see there is about 8 gb of data under the C:\Program Files\cognos\crn\temp\sds\attachments.  Does anyone know what these files are used for?  What issues could we cause if we delete them?  They have no extension on them either.  They look similar to this A404A3DB0075AE820130DC65A3758F36.  Any feedback would be greatly appreciated. Thanks for your time!