File I/O Failure: Unsupported .dat File Handling with Windows Line Endings

Bug Description
Claude is unable to read or modify ascii files with .dat and windows line endings

Environment Info

• Platform: linux
• Terminal: vscode
• Version: 1.0.83
• Feedback ID: 6658afa9-271c-4492-abd4-712dcf3d5d70

Errors

[{"error":"Error: Language not supported while highlighting code, falling back to markdown: mms\n    at k3 (/$bunfs/root/claude:1638:1192)\n    at map (native:1:11)\n    at zQ (/$bunfs/root/claude:1638:905)\n    at DtG (/$bunfs/root/claude:2222:5239)\n    at AE (/$bunfs/root/claude:188:19859)\n    at Ny (/$bunfs/root/claude:190:42827)\n    at Uy (/$bunfs/root/claude:190:38350)\n    at LR (/$bunfs/root/claude:190:38278)\n    at vE (/$bunfs/root/claude:190:38132)\n    at kK (/$bunfs/root/claude:190:35195)","timestamp":"2025-08-17T18:22:49.378Z"},{"error":"Error: Language not supported while highlighting code, falling back to markdown: mms\n    at k3 (/$bunfs/root/claude:1638:1192)\n    at map (native:1:11)\n    at zQ (/$bunfs/root/claude:1638:905)\n    at DtG (/$bunfs/root/claude:2222:5239)\n    at AE (/$bunfs/root/claude:188:19859)\n    at Ny (/$bunfs/root/claude:190:42827)\n    at Uy (/$bunfs/root/claude:190:38350)\n    at LR (/$bunfs/root/claude:190:38278)\n    at vE (/$bunfs/root/claude:190:38132)\n    at kK (/$bunfs/root/claude:190:35195)","timestamp":"2025-08-17T18:22:49.385Z"},{"error":"Error: Language not supported while highlighting code, falling back to markdown: mms\n    at k3 (/$bunfs/root/claude:1638:1192)\n    at map (native:1:11)\n    at zQ (/$bunfs/root/claude:1638:905)\n    at HtG (/$bunfs/root/claude:2222:8539)\n    at AE (/$bunfs/root/claude:188:19859)\n    at Ny (/$bunfs/root/claude:190:42827)\n    at Uy (/$bunfs/root/claude:190:38350)\n    at LR (/$bunfs/root/claude:190:38278)\n    at vE (/$bunfs/root/claude:190:38132)\n    at kK (/$bunfs/root/claude:190:35195)","timestamp":"2025-08-17T18:30:16.997Z"},{"error":"Error: Language not supported while highlighting code, falling back to markdown: mms\n    at k3 (/$bunfs/root/claude:1638:1192)\n    at map (native:1:11)\n    at zQ (/$bunfs/root/claude:1638:905)\n    at DtG (/$bunfs/root/claude:2222:5239)\n    at AE (/$bunfs/root/claude:188:19859)\n    at Ny (/$bunfs/root/claude:190:42827)\n    at Uy (/$bunfs/root/claude:190:38350)\n    at LR (/$bunfs/root/claude:190:38278)\n    at vE (/$bunfs/root/claude:190:38132)\n    at kK (/$bunfs/root/claude:190:35195)","timestamp":"2025-08-17T18:30:30.459Z"},{"error":"Error: Language not supported while highlighting code, falling back to markdown: mms\n    at k3 (/$bunfs/root/claude:1638:1192)\n    at map (native:1:11)\n    at zQ (/$bunfs/root/claude:1638:905)\n    at HtG (/$bunfs/root/claude:2222:8539)\n    at AE (/$bunfs/root/claude:188:19859)\n    at Ny (/$bunfs/root/claude:190:42827)\n    at Uy (/$bunfs/root/claude:190:38350)\n    at LR (/$bunfs/root/claude:190:38278)\n    at vE (/$bunfs/root/claude:190:38132)\n    at kK (/$bunfs/root/claude:190:35195)","timestamp":"2025-08-17T18:30:38.294Z"},{"error":"Error: Language not supported while highlighting code, falling back to markdown: mms\n    at k3 (/$bunfs/root/claude:1638:1192)\n    at map (native:1:11)\n    at zQ (/$bunfs/root/claude:1638:905)\n    at HtG (/$bunfs/root/claude:2222:8539)\n    at AE (/$bunfs/root/claude:188:19859)\n    at Ny (/$bunfs/root/claude:190:42827)\n    at Uy (/$bunfs/root/claude:190:38350)\n    at LR (/$bunfs/root/claude:190:38278)\n    at vE (/$bunfs/root/claude:190:38132)\n    at kK (/$bunfs/root/claude:190:35195)","timestamp":"2025-08-17T18:30:38.295Z"},{"error":"Error: Language not supported while highlighting code, falling back to markdown: mms\n    at k3 (/$bunfs/root/claude:1638:1192)\n    at map (native:1:11)\n    at zQ (/$bunfs/root/claude:1638:905)\n    at DtG (/$bunfs/root/claude:2222:5239)\n    at AE (/$bunfs/root/claude:188:19859)\n    at Ny (/$bunfs/root/claude:190:42827)\n    at Uy (/$bunfs/root/claude:190:38350)\n    at LR (/$bunfs/root/claude:190:38278)\n    at vE (/$bunfs/root/claude:190:38132)\n    at kK (/$bunfs/root/claude:190:35195)","timestamp":"2025-08-17T18:30:41.441Z"},{"error":"Error: Language not supported while highlighting code, falling back to markdown: mms\n    at k3 (/$bunfs/root/claude:1638:1192)\n    at map (native:1:11)\n    at zQ (/$bunfs/root/claude:1638:905)\n    at DtG (/$bunfs/root/claude:2222:5239)\n    at AE (/$bunfs/root/claude:188:19859)\n    at Ny (/$bunfs/root/claude:190:42827)\n    at Uy (/$bunfs/root/claude:190:38350)\n    at LR (/$bu

Note: Error logs were truncated.