As of the release of RStudio version 1.2.1335-1 (April 8th, 2019) I am no longer able to load *.R or *.rmd files and consequentially I continue to run version 1.1.463 on a work computer via an external drive. When trying to load a file I receive an Error while opening .... Access is denied. If I start a new R or R notebook file and then try and save it I get a Confirm Change File Type error ... This file was created as an R script however the file extension you specified will change it into another file type that will no longer open as an R script. Are you sure you want to change the type of the file so that it is no longer an R script? -- Yes -- Error Saving File. The filename, directory name, or volume label syntax is incorrect. This problem does not occur in any version of RStudio prior to and or including 1.1.463.