8. A system, comprising: one or more processors; a computer-readable memory containing instructions to cause the one or more processors to perform operations, including: receiving a plurality of concurrent requests to generate previews of a plurality of files, wherein the previews include pre-determined content or dynamically generated content, and wherein the plurality of files each have an associated file type; determining an order of the plurality of concurrent requests to generate the previews; determining the associated file types for the plurality of files; determining that an associated file type for a first file in the plurality of files is associated with pre-determined content; generating a preview of the first file, wherein the preview of the first file includes the predetermined content; determining that an associated file type for a second file in the plurality of files is not associated with pre-determined content; matching the file type for the second file with a plug-in, wherein the plug-in is capable of processing content in the second file; using the plug-in for the second file to process the content in the second file and to dynamically generate content for a preview of the second file, wherein dynamically generating the content includes translating the second file, using the plug-in, from a native format to a format different than the native format, wherein the generated preview of the second file includes the dynamically generated content, and wherein the previews of the first and second files are generated in accordance with the determined order of the plurality of concurrent requests; and displaying the previews of the first and second files in an overlapping manner in a preview view area.
8. A system, comprising: one or more processors; a computer-readable memory containing instructions to cause the one or more processors to perform operations, including: receiving a plurality of concurrent requests to generate previews of a plurality of files, wherein the previews include pre-determined content or dynamically generated content, and wherein the plurality of files each have an associated file type; determining an order of the plurality of concurrent requests to generate the previews; determining the associated file types for the plurality of files; determining that an associated file type for a first file in the plurality of files is associated with pre-determined content; generating a preview of the first file, wherein the preview of the first file includes the predetermined content; determining that an associated file type for a second file in the plurality of files is not associated with pre-determined content; matching the file type for the second file with a plug-in, wherein the plug-in is capable of processing content in the second file; using the plug-in for the second file to process the content in the second file and to dynamically generate content for a preview of the second file, wherein dynamically generating the content includes translating the second file, using the plug-in, from a native format to a format different than the native format, wherein the generated preview of the second file includes the dynamically generated content, and wherein the previews of the first and second files are generated in accordance with the determined order of the plurality of concurrent requests; and displaying the previews of the first and second files in an overlapping manner in a preview view area. 14. The system of claim 8 , further comprising instructions to cause the one or more processors to perform operations, including: displaying previews of the plurality of files, wherein the previews include a main preview, wherein the main preview is currently interactive, and wherein other previews are displayable to the left or the right of the main preview.